DI4V4-01
Vehicle Brought to Workshop
Customer Problem Analysis
P.
Check and Clear DTC (Precheck)
P.
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom Confirmation
Symptom Simulation
P.
Symptom
does not occur
Symptom
occurs
DTC Check
P.
Sensor Check
Circuit Inspection
∼
DTC Chart
P.
Malfunction code
Problem Symptoms Chart
P.
Check for Fluid Leakage
P.
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
6
7
8
9
10
11
Step 2, 5, 8, 9, 11: Diagnostic steps permitting the use of the
TOYOTA hand-held tester or TOYOTA
break-out-box.
DI-440
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
668
Author:
Date:
1997 SUPRA (RM502U)
ANTI-LOCK BRAKE SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.
DI4V5-01
ABS Check Sheet
Inspector’s
Name
:
Customer’s Name
Date Vehicle
Brought In
Registration Year
Registration No.
Frame No.
Odometer Reading
/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs
/ /
Continuous
Intermittent ( times a day)
Remains ON
Does not Light Up
Symptoms
km
miles
ABS does not operate.
ABS Warning Light
Abnormal
ABS does not operate efficiently.
Check Item
TRAC Indicator
Light
Normal
Does not Light Up
2nd Time
Normal Code
Malfunction Code (Code )
Normal Code
Malfunction Code (Code )
1st Time
DTC Check
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-441
669
Author:
Date:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK
DI4V6-01
F02620
R06980
Short Pin
DLC1
S−17−1 Iei−23−1−A
F00041
DLC2
Tc
E1
DLC1
Tc
E1
R01346
Normal Code
2 sec.
ON
OFF
0.25
sec.
0.25
sec.
Code 11 and 21
0.5
sec.
4 sec.
1.5
sec. 2.5 sec.
0.5
sec.
Code 21
Code 11
ON
OFF
DI-442
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
670
Author:
Date:
1997 SUPRA (RM502U)
PRE-CHECK
1.
DIAGNOSIS SYSTEM
(a)
Check the Indicator,
When the ignition switch is turned ON, check that the ABS
warning light goes on for 3 seconds.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the ABS warning light circuit (See page
(b)
Check the DTC.
(1)
Turn the ignition switch ON.
(2)
Disconnect the short pin from DLC1.
(3)
Using SST, connect terminals Tc and E1 of DLC2 or
DLC1.
SST
09843-18020
(4)
Read the DTC from the ABS warning light on the
combination meter.
HINT:
If no code appears, inspect the diagnostic circuit or ABS warn-
ing light circuit (See page
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(5)
Codes are explained in the code table on page
(6)
After completing the check, disconnect terminals Tc
and E1, and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.
FI6997
TOYOTA
Hand-held
tester
DLC2
BR3890
R06980
Short Pin
DLC1
N09348
TOYOTA hand-held tester
ECU
TOYOTA brake-out-box
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-443
671
Author:
Date:
1997 SUPRA (RM502U)
(c)
Using TOYOTA hand-held tester, check the DTC.
(1)
Hook up the TOYOTA hand- held tester to the
DLC2.
(2)
Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand-held tester oper-
ator’s manual for further details.
(d)
Clear the DTC.
(1)
Using SST, connect terminals Tc and E1 of DLC2 or
DLC1 and remove the short pin from DLC1.
SST
09843-18020
(2)
IG switch ON.
(3)
Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 5 seconds.
(4)
Check that the warning light shows the normal
code.
(5)
Remove the SST from the terminals of DLC2 or
DLC1.
SST
09843-18020
(6)
Connect the short pin to DLC1.
HINT:
Disconnecting the battery cable during repairs will not erase the
DTC in the ECU.
(e)
Using TOYOTA brake-out-box and TOYOTA hand-held
tester, measure the ECU terminal values.
(1)
Turn the IG switch OFF.
(2)
Hook up the TOYOTA hand-held tester and TOYO-
TA break-out-box to the vehicle.
(3)
Turn the IG switch ON.
(4)
Read the ECU input/output values by following the
prompts on the tester screen.
HINT:
TOYOTA hand-held tester has a ”Snapshot” function.
This records the measured values and is effective in the diagno-
sis of intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break-
out-box operator’s manual for further details.
F00007
E1
Tc
Ts
lei-23-1-A
DLC1
BR3904
0.13 sec.
0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
7
2
7
6
ON
OFF
0.5 sec. 0.5 sec.
1.5 sec.
0.5 sec.
0.5 sec.
2.5 sec.
4 sec.
Repeat
DI-444
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
672
Author:
Date:
1997 SUPRA (RM502U)
2.
SPEED SENSOR SIGNAL AND DECELERATION SEN-
SOR
(a)
Check the speed sensor signal and deceleration sensor.
(1)
Turn the ignition switch OFF
(2)
Using SST, connect terminal Ts and E1 of DLC1.
SST
09843-18020
(3)
Start the engine.
(4)
Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS
warning light circuit (See page
If the ABS warning light is always on, inspect and repair,
deceleration sensor.
(5)
Drive the vehicle faster than 45 km/h (28 mph) for
several seconds.
(6)
Stop the vehicle.
(7)
Using SST, connect terminals Tc an E1 of DLC1.
SST
09843-18020
(8)
Read the number of blinks of the ABS warning light.
HINT:
See the list of DTC shown on the next page.
If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(9)
After doing the check, disconnect terminals Ts and
E1, Tc and E1 of DLC1, and turn ignition switch OFF.
FI6997
TOYOTA
Hand-held
tester
DLC2
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-445
673
Author:
Date:
1997 SUPRA (RM502U)
(b)
Using TOYOTA hand-held tester, check the DTC.
(1)
Do step (1) - (6) on the previous page.
(2)
Hook up the TOYOTA hand- held tester to the
DLC2.
(3)
Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand-held tester oper-
ator’s manual for farther details.
DTC of speed sensor check function:
Code No.
Diagnosis
Trouble Area
71
Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Sensor Rotor
72
Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Sensor Rotor
73
Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Sensor Rotor
74
Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Sensor Rotor
75
Abnormal change in output voltage of right front speed sensor
Right front speed sensor rotor
76
Abnormal change in output voltage of left front speed sensor
Left front speed sensor rotor
77
Abnormal change in output voltage of right rear speed sensor
Right rear speed sensor rotor
78
Abnormal change in output voltage of left rear speed sensor
Left rear speed sensor rotor
79*
Deceleration sensor is faulty
Deceleration sensor
Sensor installation
*: SPORT ABS (2JZ-GTE Engine) only
R10305
GL2
VGS
GGND
GL1
Rear Side
Front Side
DI-446
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
674
Author:
Date:
1997 SUPRA (RM502U)
3.
DECELERATION SENSOR OPERATION DIAGNOSIS
SYSTEM
CAUTION:
While checking the deceleration sensor operating diagno-
sis system, the Anti-lock Brake System does not work and
brake system works as a conventional brake system.
(a)
Deceleration sensor inspection check of deceleration
sensor output:
(1)
Connect 3 dry batteries of 1.5 V in series.
(2)
Connect VGS terminal to the batteries’ positive (+)
terminal, and GGND terminal to the batteries’ nega-
tive (-) terminal, apply about 4.5 V between VGS-
GGND terminals.
NOTICE:
Do not apply voltage of 6 V or more to terminals VGS and
GGND.
(3)
Check the output of GL1 and GL2 terminals.
Symbols
Condition
Standard Value
GL1
Horizontal
about 2.3 V
GL1
Lean forward
0.4 - about 2.3 V
GL1
Lean rearward
about 2.3 V - 4.1 V
GL2
Horizontal
about 2.3 V
GL2
Lean forward
about 2.3 V - 4.1 V
GL2
Lean rearward
0.4 - about 2.3 V
HINT:
If the senor is tilted too much it may show the wrong value.
If dropped, the sensor should be replaced with a new one.
The sensor removed from the vehicle should not be
placed upside down.
DI4V7-01
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-447
675
Author:
Date:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, turn to the page referred to under the ”See page” for the respective ”DTC No.” in the DTC chart.
HINT:
Using SST 09843-18020, connect the terminals Tc and E1, and remove the short pin.
If any abnormality is not found when inspect each inspection parts, inspect the ECU.
DTC No.
(See Page)
Detection Item
Trouble Area
11
(
)
Open circuit in ABS solenoid relay circuit
ABS solenoid relay
Open or short in ABS solenoid relay circuit
12
(
)
Short circuit in ABS solenoid relay circuit
ABS solenoid relay
B+ short in ABS solenoid relay circuit
13*
2
(
)
Open circuit in ABS motor relay circuit
ABS motor relay
Open or short in ABS motor relay circuit
14
(
)
Short circuit in ABS motor relay circuit
ABS motor relay
B+ short in ABS motor relay circuit
21
(
)
Open or short circuit in 2-position solenoid circuit for right front
wheel
ABS actuator
Open or short in SFRH or SFRR circuit
22
(
)
Open or short circuit in 2-position solenoid circuit for left front
wheel
ABS actuator
Open or short in SFLH or SFLR circuit
23
(
)
Open or short circuit in 2-position solenoid circuit for right rear
wheel
ABS actuator
Open or short in SRH (SRRH) or SRR (SRRR) circuit
24*
1
(
)
Open or short circuit in 2-position solenoid circuit for left rear
wheel
ABS actuator
Open or short in SRLH or SRLR circuit
31*
2
(
)
Right front wheel speed sensor signal malfunction
32*
2
(
)
Left front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor
O
h t i
h
d
i
it
33*
2
(
)
Right rear wheel speed sensor signal malfunction
Open or short in each speed sensor circuit
Speed sensor rotor
34*
2
(
)
Left rear wheel speed sensor signal malfunction
41
(
)
Low battery positive voltage
Battery
IC regulator
Open or short in power source circuit
43*
1
(
)
Malfunction in deceleration sensor
(constant output)
Deceleration sensor
Wire harness for deceleration sensor system
44*
1
(
)
Open or short in deceleration sensor circuit
Deceleration sensor
Open or short in deceleration sensor circuit
45*
1
(
)
Malfunction in deceleration sensor
Deceleration sensor
Wire harness for deceleration sensor system
49
(
)
Open circuit in stop light switch circuit
Open in stop light circuit
51*
2
(
)
Pump motor is locked
Open in pump motor ground
ABS pump motor
Always
ON
(
)
Malfunction in ECU
IG power source circuit
Battery
IC regulator
Open or short in power source circuit
DI-448
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
676
Author:
Date:
1997 SUPRA (RM502U)
*1: Short ABS (2JZ-GTE Engine) only
*2: As DTC cannot be erased by replacing parts alone, do either of the following operations.
Clear DTC (See page
At the vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.
DI4V8-01
W02807
2JZ-GE:
2JZ-GTE:
2JZ-GTE:
SPORT AVS (2JZ-GTE Engine):
ABS Control
Relay
ABS Solenoid
Relay
ABS Motor Relay
ABS Actuator
Deceleration Sensor
ABS Warning Light
ABS ECU
DLC1
DLC2
Front Speed Sensor Rotor
Rear Speed Sensor
Rear Speed
Sensor Rotor
Front Speed Sensor
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-449
677
Author:
Date:
1997 SUPRA (RM502U)
PARTS LOCATION
DI7HM-01
W01411
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
A18
A19
DI-450
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
678
Author:
Date:
1997 SUPRA (RM502U)
TERMINALS OF ECU
NORMAL ABS (2JZ-GE Engine):
Symbols (Terminal No.)
STD Voltage (V)
Condition
IG1 (A18-2) - GND (A19-2,13)
10 - 14
IG switch ON
SR (A19-18) - R+ (A19-8)
Below 1.5
IG switch ON, ABS warning light OFF
MR (A19-7) - R+ (A19-8)
10 - 14
IG switch ON
SFRH (A19-4) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
SFRR (A19-1) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
SFLH (A19-10) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
SFLR (A19-11) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
SRR (A19-22) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
SRH (A19-21) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
AST (A19-16) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
WA (A18 4)
GND (A19 2 13)
Below 2.0
IG switch ON, ABS warning light ON
WA (A18-4) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
STP (A18 12)
GND (A19 2 13)
Below 1.5
Stop light switch OFF
STP (A18-12) - GND (A19-2,13)
8 - 14
Stop light switch ON
D/G (A18-11) - GND (A19-2,13)
10 - 14
IG switch ON, ABS warning light OFF
MT (A19-9) - GND (A19-2,13)
Below 1.5
IG switch ON
Tc (A18-9) - GND (A19-2,13)
10 - 14
IG switch ON
Ts (A18-8) - GND (A19-2,13)
10 - 14
IG switch ON
FR+ (A19-3) - FR- (A19-14)
AC generation
IG switch ON
Slowly turn right front wheel
FL+ (A19-19) - FL- (A19-20)
AC generation
IG switch ON
Slowly turn left front wheel
RR+ (A18-1) - RR- (A18-7)
AC generation
IG switch ON
Slowly turn right rear wheel
RL+ (A18-3) - RL- (A18-10)
AC generation
IG switch ON
Slowly turn left rear wheel
W02803
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
A21
A20
23
24
25
26
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-451
679
Author:
Date:
1997 SUPRA (RM502U)
Sport ABS (2JZ-GTE Engine):
Symbols (Terminal No.)
STD Voltage (V)
Condition
IG1 (A20-13) - GND (A20-12,25)
10 - 14
IG switch ON
SR (A21-7) - R+ (A20-26)
10 - 14
IG switch ON, ABS warning light OFF
MR (A21-1) - R+ (A20-26)
Below 1.0
IG switch ON
SFRH (A20-2) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SFRR (A20-1) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SFLH (A21-5) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SFLR (A21-6) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SRRH (A21-11) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SRRR (A21-12) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SRLH (A20-15) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
SRLR (A20-14) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
AST (A21-4) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
WA (A20 11)
GND (A20 12 25)
Below 2.0
IG switch ON, ABS warning light ON
WA (A20-11) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
STP (A20 5)
GND (A20 12 25)
Below 1.5
Stop light switch OFF
STP (A20-5) - GND (A20-12,25)
8 - 14
Stop light switch ON
D/G (A20-24) - GND (A20-12,25)
10 - 14
IG switch ON, ABS warning light OFF
MT (A21-10) - GND (A20-12,25)
Below 1.5
IG switch ON
Tc (A20-8) - GND (A20-12,25)
10 - 14
IG switch ON
Ts (A20-21) - GND (A20-12,25)
10 - 14
IG switch ON
FR+ (A21-3) - FR- (A21-9)
AC generation
IG switch ON
Slowly turn right front wheel
FL+ (A21-8) - FL- (A21-2)
AC generation
IG switch ON
Slowly turn left front wheel
RR+ (A20-10) - RR- (A20-23)
AC generation
IG switch ON
Slowly turn right rear wheel
RL+ (A20-22) - RL- (A20-9)
AC generation
IG switch ON
Slowly turn left rear wheel
FRO (A20-7) - GND (A20-12,25)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
FLO (A20-20) - GND (A20-12,25)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
RRO (A20-6) - GND (A20-12,25)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
RLO (A20-19) - GND (A20-12,25)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
GL1 (A20-4) - GND (A20-12,25)
0.5 - 4.5 V
IG switch ON
GL2 (A20-16) - GND (A20-12,25)
0.5 - 4.5 V
IG switch ON
VGS (A20-3) - GND (A20-12,25)
4.5 - 5.5 V
IG switch ON
DI4VA-01
DI-452
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
680
Author:
Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When removing the ECU, turn the IG switch OFF.
Symptoms
Inspection Circuit
See page
ABS does not operate.
Only when 1. - 4. are all normal and the problem is still occurring, replace the ABS
ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. IG power source circuit.
3. Speed sensor circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page
).
or XXX
ABS does not operate
efficiently.
Only when 1. - 4. are all normal and the problem is still occurring, replace the ABS
ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. Speed sensor circuit.
3. Stop light switch circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page
).
or
ABS warning light
abnormal.
1. ABS warning light circuit.
2. ABS ECU.
DTC check cannot be done.
Only when 1. and 2. are all normal and the problem is still occurring, replace the
ABS ECU.
1. ABS warning light circuit.
2. Tc terminal circuit.
Speed sensor signal check
cannot be done.
1. Ts terminal circuit.
2. ABS ECU.
DI4VB-01
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-453
681
Author:
Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC
11, 12
ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.
DTC Detecting Condition
Trouble Area
11
Conditions (1) and (2) continue for 0.2 sec. or more:
(1) ABS solenoid relay terminal (SR)
voltage: Below 1.5V
(2) Solenoid relay monitor terminal (AST)
voltage: 0 V
ABS solenoid relay
Open or short in ABS solenoid relay circuit
12
Conditions (1) and (2) continue for 0.2 sec. or more:
(1) ABS solenoid relay terminal (SR)
voltage: Battery positive voltage
(2) Solenoid relay monitor terminal (AST)
voltage: Battery positive voltage
ABS solenoid relay
B+ short in ABS solenoid relay circuit
Fail safe function:
If trouble occurs in the ABS solenoid relay circuit, the ECU cuts off current to the ABS solenoid relay and
prohibits ABS control.
F02626
F02627
F02628
R/B
No.2
Battery
B
W-B
W-B
W-B
EA
A6
A6
A6
A6
A6
A9
A8
A9
A9
A8
A8
A8
A9
IB6
IB6
IB6
A19
A19
A19
2A
1
AL
T
1
2
2
ABS
No.1
2
R
R
1
2
6
ABS Control Relay 4
3
1
Solenoid
Relay
DLC1
L-B
L-B
V-W
V-W
V
V
7
8
18
ABS ECU
MR
R+
SR
AST
MT
16
9
A19
A19
Y-G
G-W
2
13
1
6
5
IB6
IB6
Y-G
G-W
5
3
ABS Actuator
ABS ECU
5
4
2
2
L
L-W
Motor
Relay
R/B
No.2
ABS No.1
AL
T
2A
1
1
1
1
2
2
2
Battery
B
R
R/B No.5
ABS Solenoid
Relay
W-B
5
5
5
5
5
5
1
2
3
5
4
6
DLC1
L-B
L-B
V-W
V-W
IB6
IB6
6
5
1
13
IB6
A21
A20
7
26
A21
4
Y-G
Y-G
A6
5
ABS ECU
L-W
A6
4
ABS Actuator
EA
SR
R+
ABS ECU
2JZ-GE Engine (NORMAL ABS):
2JZ-GTE Engine (SPORT ABS):
R
AST
DI-454
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
682
Author:
Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
F02629
F02630
F02631
LOCK
A9
(+)
(-)
W02799
ABS Solenoid
Relay
ABS
Actuator
ECU
A9
A6
A6
A6
A6
A19
16
5
4
5
4
5
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-455
683
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE (2JZ-GE Engine)
1
Check voltage between terminals A9 - 2 and A9 - 6 of ABS control (solenoid)
relay connector.
PREPARATION:
Disconnect the ABS control (solenoid) relay connector.
CHECK:
Measure voltage between terminals A9 - 2 and A9 - 6 of ABS
control (solenoid) relay harness side connector.
OK:
Voltage: 10 - 14 V
NG
Check and repair harness or connector.
OK
2
Check continuity between terminal A9 - 5 of ABS control (solenoid) relay con-
nector and terminal A19 - 16 of ABS ECU.
CHECK:
Check continuity between terminal A9 - 5 of ABS control (sole-
noid) relay connector and terminal A19 - 16 of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 26
∼
40
Ω
between terminals A6 - 4 and
A6 - 5 of ABS actuator.
NG
Repair or replace harness or ABS actuator.
OK
F03349
F02634
F02635
Open
Continuity
Continuity
A8
A8
A9
Open
(+)
(-)
DI-456
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
684
Author:
Date:
1997 SUPRA (RM502U)
3
Check ABS control (solenoid) relay.
CHECK:
Check continuity between each terminal of ABS control (sole-
noid) relay.
OK:
Terminals A9 - 1 and A8 - 3
Continuity (Reference value 80
Ω
)
Terminals A9 - 5 and A9 - 6
Continuity
Terminals A9 - 2 and A9 - 5
Open
CHECK:
(a)
Apply battery voltage between terminals A9 - 1 and A8
- 3.
(b)
Check continuity between each terminal of ABS control
(solenoid) relay.
OK:
Terminals A9 - 5 and A9 - 6
Open
Terminals A9 - 2 and A9 - 5
Continuity
NG
Replace ABS control relay.
OK
4
Check for open and short in harness and connector between ABS control
(solenoid) relay and ABS ECU (See page
).
NG
Repair or replace harness or connector.
OK
If the same code is still output a after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
F02629
F02636
F02637
LOCK
R/B No.5
(-)
(+)
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-457
685
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE (2JZ-GTE Engine)
1
Check voltage between terminals 1 and 2 of R/B No.5 (for ABS solenoid relay).
PREPARATION:
Remove ABS solenoid relay from R/B No.5.
CHECK:
Measure voltage between terminals 1 and 2 of R/B No.5 (for
ABS solenoid relay).
OK:
Voltage: 10 - 14 V
NG
Check and repair harness or connector.
OK
F02638
ABS Solenoid
Relay
ABS
Actuator
ECU
A6
A6
A6
A6
A21
5
4
3
4
5
4
DI-458
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
686
Author:
Date:
1997 SUPRA (RM502U)
2
Check continuity between terminal 3 of R/B No.5 (for ABS solenoid relay) and
terminal A21 - 4 of ABS ECU.
CHECK:
Check continuity between terminal 3 of R/B No.5 (for ABS sole-
noid relay) and terminal A21 - 4 of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 26
∼
40
Ω
between terminals A6 - 4 and
A6 - 5 of ABS actuator.
NG
Repair or replace harness or ABS actuator.
OK
F02639
F02640
F02641
F02642
3
2
1
4
5
6
Open
Continuity
Continuity
Continuity
Open
(+)
(-)
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-459
687
Author:
Date:
1997 SUPRA (RM502U)
3
Check ABS solenoid relay.
PREPARATION:
Remove solenoid relay from R/B No.5.
CHECK:
Check continuity between each terminal of ABS solenoid relay.
OK:
Terminals 4 and 6
Continuity (Reference value 80
Ω
)
Terminals 2 and 3
Continuity
Terminals 1 and 3
Open
CHECK:
(a)
Apply battery voltage between terminals 4 and 6.
(b)
Check continuity between each terminal of ABS solenoid
relay.
OK:
Terminals 2 and 3
Open
Terminals 1 and 3
Continuity
NG
Replace ABS control relay.
OK
4
Check for open and short in harness and connector between ABS solenoid relay
and ABS ECU (See page
).
NG
Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
DI-466
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
694
Author:
Date:
1997 SUPRA (RM502U)
DTC
21, 22, 23, 24
ABS Actuator Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the fluid pressure acting on the
brake cylinders, thus controlling the braking force.
DTC No.
DTC Detecting Condition
Trouble Area
21
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SFR is 0 V or battery positive voltage.
ABS actuator
Open or short in SFR circuit
22
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SFL is 0 V or battery positive voltage.
ABS actuator
Open or short in SFL circuit
23
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SRH (SRRH) or SRR (SRRR) is 0 V or battery positive volt-
age.
ABS actuator
Open or short in SRH (SRRH) or SRR (SRRR) circuit
24*
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SRLH or SRLR is 0 V or battery positive voltage.
ABS actuator
Open or short in SRLH or SRLR circuit
Fail safe function:
If trouble occurs in the ABS actuator solenoid circuit, the ECU cuts off current to the ABS solenoid relay and
prohibits ABS control.
*: SPORT ABS (2JZ-GTE Engine) only
DI4VD-01
F03320
F03321
F03322
R/B
No.2
Battery
B
W-B
EA
A6
A7
A6
A9
A9
A8
A19
2A
1
AL
T
1
2
2
ABS
No.1
2
R
R
1
2
6
DLC1
L-W
ABS ECU
A19
A19
IB6
Y-G
ABS ECU
4
R/B
No.2
ABS No.1
1
1
2
2
Battery
R/B No.2
5
1
2
4
IB5
A21
A20
A6
EA
2JZ-GE Engine (NORMAL ABS):
2
1
1
ABS ECU
6
IB6
A21
R
ABS Control Relay
Motor
Relay
A7
A7
A7
A7
A7
A19
A19
A19
A19
IB5
IB5
IB5
IB5
IB5
IB5
ABS Actuator
A9
Solenoid
Relay
5
ABS Pump
Motor
P
P-L
Y
Y-R
B-Y
B-R
Y-G
P
P-L
Y
Y-R
B-Y
B-R
5
1
5
6
2
8
7
5
5
8
7
9
4
3
1
4
11
10
22
21
16
SFLR
Monitor
SFLH
SFRR
SFRH
SRR
SRH
AST
5
5
5
3
5
5
5
ABS ECU
R
2JZ-GTE Engine (SPORT ABS):
W-B
A6
4
L-W
AL
T
2A
B
ABS Actuator
Monitor
A20
A21
A21
A20
A20
A21
IB5
IB5
IB5
IB5
IB5
IB5
IB5
Y
Y
Y-R
Y-R
B-Y
B-Y
B-R
B-R
P
P
P-L
P-L
P-B
P-B
R-L
R-L
Y-G
Y-G
A7
A7
A7
A7
A7
A7
A7
A7
1
DLC1
1
1
5
5
5
5
5
2
2
6
6
6
4
4
4
8
8
3
3
7
7
9
10
11
12
15
14
ABS Solenoid
Relay
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
AST
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-467
695
Author:
Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
F03323
1 2 3 4
5 6 7 8
4
A6
A6
DI-468
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
696
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check ABS actuator solenoid.
CHECK:
NORMAL ABS (2JZ-GE Engine):
Check continuity between terminal A6 - 4 and A7 - 1, 2, 5, 6,
7, 8 of ABS actuator connector.
SPORT ABS (2JZ-GTE Engine):
Check continuity between terminal A6 - 4 and A7 - 1, 2, 3, 4,
5, 6, 7, 8 of ABS actuator connector.
OK:
Continuity
HINT:
Resistance of each of the solenoids SFRH, SFLH, SRRH and
SRLH is 5.0
Ω
.
Resistance of each of the solenoids SFRR, SFLR, SRRR and
SRLR is 2.2
Ω
.
NG
Replace ABS actuator.
OK
2
Check for open and short in harness and connector between ABS ECU and ac-
tuator (See page
NG
Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
DI-460
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
688
Author:
Date:
1997 SUPRA (RM502U)
DTC
13, 14
ABS Motor Relay Circuit
CIRCUIT DESCRIPTION
This ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the motor relay ON and operates the ABS pump motor.
DTC No.
DTC Detecting Condition
Trouble Area
13
Conditions (1) and (2) continue for 0.2 sec. or more:
(1) ABS motor relay terminal (MR)
voltage: Below 1.5V
(2) Motor relay monitor terminal (MT)
voltage: 0 V
ABS motor relay
Open or short in ABS motor relay circuit
14
Conditions (1) and (2) continue for 4 sec. or more:
(1) ABS motor relay terminal (MR)
voltage: Battery positive voltage
(2) Motor relay monitor terminal (MT)
voltage: Battery positive voltage
ABS motor relay
B+ short in ABS motor relay circuit
Fail safe function:
If trouble occurs in the ABS motor relay circuit, the ECU cuts off the current to the ABS solenoid relay and
prohibits ABS control.
DI4VC-01
F02626
F02643
F02644
R/B
No.2
Battery
B
W-B
W-B
W-B
EA
A6
A6
A6
A6
A6
A9
A8
A9
A9
A8
A8
A8
A9
IB6
IB6
IB6
A19
A19
A19
2A
1
AL
T
1
2
2
ABS No.1
2
R
R
1
2
6
ABS Control Relay 4
3
1
Solenoid
Relay
DLC1
L-B
L-B
V-W
V-W
V
V
7
8
18
ABS ECU
MR
R+
SR
AST
MT
16
9
A19
A19
Y-G
G-W
2
13
1
6
5
IB6
IB6
Y-G
G-W
5
3
ABS Actuator
ABS ECU
5
4
2
2
L
L-W
Motor
Relay
R/B
No.2
ABS No.1
AL
T
1
1
2
2
Battery
B
R/B No.5
5
5
5
1
2
3
4
V-W
V-W
IB6
IB6
6
2
13
A21
A20
26
A6
A6
ABS Pump Motor
EA
MR
R+
2JZ-GE Engine (NORMAL ABS):
2JZ-GTE Engine (SPORT ABS):
R
5
2
L
W-B
A6
1
3
1
ABS ECU
G-W
G-W
6
IB6
A21
10
MT
ABS Motor Relay
V
V
R
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-461
689
Author:
Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
F02629
F02645
F02646
LOCK
A8
W02801
ABS Solenoid
Relay
ABS
Actuator
ECU
A8
A6
A6
A6
A6
A19
3
9
2
2
2
DI-462
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
690
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE (2JZ-GE Engine)
1
Check voltage between terminal A8 - 1 of ABS control (motor) relay connector
and body ground.
PREPARATION:
Disconnect the ABS control (motor) relay connector.
CHECK:
Measure voltage between terminal A8 - 1 of ABS control (mo-
tor) relay connector and body ground.
OK:
Voltage: 10 - 14 V
NG
Check and repair harness or connector.
OK
2
Check continuity between terminal A8 - 2 of ABS control (motor) relay connector
and terminal A19 - 9 of ABS ECU.
CHECK:
Check continuity between terminal A8 - 2 of ABS control (mo-
tor) relay connector and terminal A19 - 9 of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 26
∼
40
Ω
between terminals A6 - 2 and
A6 - 3 of ABS actuator.
NG
Repair or replace harness or ABS actuator.
OK
F02648
Open
Continuity
Continuity
A8
A8
A9
A9
1
3
4
2
1
3
4
2
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-463
691
Author:
Date:
1997 SUPRA (RM502U)
3
Check ABS control (motor) relay.
CHECK:
Check continuity between each terminal of ABS control (motor)
relay.
OK:
Terminals A8 - 3 and A8 - 4
Continuity (Reference value 62
Ω
)
Terminals A8 - 1 and A8 - 2
Open
CHECK:
(a)
Apply battery voltage between terminals A8 - 3 and A8
- 4.
(b)
Check continuity between terminals of ABS control (mo-
tor) relay.
OK:
Terminals A8 - 1 and A8 - 2
Continuity
NG
Replace ABS control relay.
OK
4
Check for open and short in harness and connector between ABS motor relay
and ABS ECU (See page
).
NG
Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
F02629
F02649
F02650
LOCK
R/B No.5
(+)
(-)
F03315
ABS Solenoid
Relay
ABS
Actuator
ECU
A6
A6
A6
A6
A21
2
2
2
3
10
DI-464
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
692
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE (2JZ-GTE Engine)
1
Check voltage between terminal 1 of R/B No.5 (for ABS motor relay) and body
ground.
PREPARATION:
Remove ABS motor relay from R/B No.5.
CHECK:
Measure voltage between terminal 1 of R/B No.5 (for ABS mo-
tor relay) and body ground.
OK:
Voltage: 10 - 14 V
NG
Check and repair harness or connector.
OK
2
Check continuity between terminal 2 of R/B No.5 (for ABS motor relay) and termi-
nal A21 - 10 of ABS ECU.
CHECK:
Check continuity between terminal 2 of R/B No.5 (for ABS mo-
tor relay) and terminal A21 - 10 of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 26
∼
40
Ω
between terminals A6 - 2 and
A6 - 3 of ABS actuator.
NG
Repair or replace harness or ABS actuator.
OK
F03316
F03317
F03318
F03319
1
2
3
4
Open
Continuity
Continuity
(-)
(+)
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-465
693
Author:
Date:
1997 SUPRA (RM502U)
3
Check ABS motor relay.
PREPARATION:
Remove motor relay from R/B No.5.
CHECK:
Check continuity between each terminal of motor relay.
OK:
Terminals 3 and 4
Continuity (Reference value 62
Ω
)
Terminals 1 and 2
Open
CHECK:
(a)
Apply battery voltage between terminals 3 and 4.
(b)
Check continuity between terminals.
OK:
Terminals 1 and 2
Continuity
NG
Replace ABS motor relay.
OK
4
Check for open and short in harness and connector between ABS motor relay
and ABS ECU (See page
).
NG
Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
BR3583
BR3582
F00010
Rotor
Speed Sensor
Coil
N
S Magnet
To ECU
Low Speed
High Speed
+V
-V
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-469
697
Author:
Date:
1997 SUPRA (RM502U)
DTC
31, 32, 33, 34
Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS control system. The front and rear rotors each have 48
serrations.
When the rotos rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.
DTC Detecting Condition
Trouble Area
31,32,33,34
Detection of any of conditions (1) through (3):
(1) At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 15 sec.
(2) Momentary interruption of the vehicle speed sensor signal
occurs at least 7 times in the time between switching the igni-
tion switch ON and switching it OFF.
(3) Abnormal fluctuation of speed sensor signals with the ve-
hicle speed 20 km/h (12 mph) or more.
Right front, left front, right rear and left rear speed sensor
Open or short in each speed sensor circuit
Sensor rotor
HINT:
DTC No.31 is for the right front speed sensor.
DTC No.32 is for the left front speed sensor.
DTC No.33 is for the right rear speed sensor.
DTC No.34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
DI4VE-01
W02989
IB5
IB5
IB2
IB2
IC2
IC2
A19 A21
8
Right Front
Speed Sensor
2
1
L
R
EA
3
14
9
19
8
2
20
1
10
7
23
3
22
10
9
FR+
FR-
ABS ECU
5V
FL+
FL-
RR+
RR-
RL+
RL-
R
L
W
B
V
LG
1
2
4
5
L
P
3
W
B
V
LG
2
2
2
1
1
1
Left Front
Speed Sensor
Right Rear
Speed Sensor
Left Rear
Speed Sensor
*1
3
*2
A19 A21
A19 A21
A19 A21
A18 A20
A18 A20
A18 A20
A18 A20
DI-470
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
698
Author:
Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
*1: NORMAL ABS (2JZ-GE Engine)
*2: SPORT ABS (2JZ-GTE Engine)
F02629
F03325
F03327
LOCK
2
1
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-471
699
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check speed sensor.
Front
PREPARATION:
(a)
Remove front fender splash shield.
(b)
Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 - 2.5 k
Ω
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 M
Ω
or higher
CHECK:
Check the sensor connector.
OK:
(1) There is not play on the connector connecting
part.
(2) Connectors are connected each other securely.
F02629
F03326
F03328
LOCK
1
2
DI-472
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
700
Author:
Date:
1997 SUPRA (RM502U)
Rear
PREPARATION:
(a)
Remove rear, seat cushion, seat back and quarter trim
panel.
(b)
Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.65 - 1.8 k
Ω
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 M
Ω
or higher
CHECK:
Check the sensor connector.
OK:
(1) There is not play on the connector connecting
part.
(2) Connectors are connected each other securely.
NG
Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page
OK
2
Check for open and short in harness and connector between each speed sensor
and ABS ECU (See page
).
NG
Repair or replace harness or connector.
OK
F03329
R00948
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-473
701
Author:
Date:
1997 SUPRA (RM502U)
3
Check sensor rotor and sensor installation.
Front
PREPARATION:
Remove front speed sensor rotor (See page
CHECK:
Check sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
CHECK:
Check the front speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between sensor and steering knuckle.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear
PREPARATION:
Remove the drive shaft (See page
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
BR3795
OK
NG
DI-474
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
702
Author:
Date:
1997 SUPRA (RM502U)
CHECK:
Check the rear speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and rear axle carri-
er.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
NG
Replace speed sensor and grease or rotor and
grease.
NOTICE:
Check the speed sensor signal last (See page
OK
Check and replace ABS ECU.
F03330
Battery
B
R/B No.2
ALT
2
2
2
2
AM1
R/B No.2
W
R/B No.1
W
2
IG Switch
J/B No.1
ABS ECU
IG1
GND1
GND2
ECU IG
4
4
4
5
13
B-Y
1B
1J
1J
1K
A18 A20
2
13
*1
*2
A20
A20
A19
A19
2
12
13
25
W-B
W-B
W-B
W-B
IG
IE
W-B
*2
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JZ-GTE Engine)
*1:
*2:
W
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-475
703
Author:
Date:
1997 SUPRA (RM502U)
DTC
41
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU and the actuators.
DTC No.
DTC Detecting Condition
Trouble Area
41
Voltage at ECU terminal IG1 is less than 9.5 V for more than
10 sec. while vehicle speed is 3 km/h (1.9 mph) or more.
Battery
IC regulator
Open or short in power source circuit
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
WIRING DIAGRAM
DI4VF-01
F02629
F03331
F03332
F03333
ON
NORMAL ABS
(2JZ-GE Enegine):
SPORT ABS
(2JZ-GTE Enegine):
IG1 GND
GND
IG1
(+)
(-)
(+)
(-)
DI-476
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
704
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check battery positive voltage.
OK:
Voltage: 10 - 14 V
NG
Check and repair the charging system.
OK
2
Check voltage between terminals IG1 and GND of ABS ECU connector.
PREPARATION:
Remove ABS ECU with connectors still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminals IG1 and GND of ABS
ECU connector.
OK:
Voltage: 10 - 14 V
OK
Check and replace ABS ECU.
NG
F02629
F03334
F03335
F03336
NORMAL ABS (2JZ-GE Engine):
SPORT ABS (2JZ-GTE Engine):
LOCK
GND
(+)
(-)
(+)
(-)
GND
GND
GND
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-477
705
Author:
Date:
1997 SUPRA (RM502U)
3
Check continuity between terminal GND of ABS ECU connector and body
ground.
CHECK:
Measure resistance between terminals GND of ABS ECU con-
nector and body ground.
OK:
Resistance: 1
Ω
or less
NG
Repair or replace harness or connector.
OK
F03337
ECU IG
J/B No.1
DI-478
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
706
Author:
Date:
1997 SUPRA (RM502U)
4
Check ECU-IG fuse.
PREPARATION:
Remove ECU-IG fuse from J/B No.1.
CHECK:
Check continuity of ECU-IG fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to ECU-IG fuse
(See attached wiring diagram).
OK
Check for open in harness and connector be-
tween ABS ECU and battery
(See page
).
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-479
707
Author:
Date:
1997 SUPRA (RM502U)
DTC
43, 45
Malfunction is Deceleration Sensor
(SPORT ABS (2JZ-GTE Engine) only)
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
43
Either of the following (1) or (2) is detected:
(1) Input from the deceleration sensor does not change at one
cycle (0 km/h
→
more than 30km/h
→
0 km/h) for 16 times
continuously.
(2) When the brake pedal is not depressed at vehicle speed of
5 km/h or more, forward and backward G (more than 0.4 G) is
detected for 30 seconds or more.
Deceleration sensor
Wire harness for deceleration sensor system
45
At vehicle speed of 30 km/h or more, the deceleration sensor
output and vehicle acceleration from wheel speed remain ab-
normally different for 60 seconds or more.
Deceleration sensor
Wire harness for deceleration sensor system
INSPECTION PROCEDURE
1
Check deceleration sensor (See page
NG
Replace deceleration sensor.
OK
2
Check for open or short in harness and connector between sensor and ABS ECU
(See page
).
NG
Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI4VG-01
F03338
Deceleration sensor
3
5
1
2
A23
A23
A23
A23
B
W-B
W
R
G
W-B
IG
IE
A20
A20
A20
A20
3
16
4
17
VGS
GL2
GL1
GGND
ABS ECU
DI-480
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
708
Author:
Date:
1997 SUPRA (RM502U)
DTC
44
Deceleration Sensor Circuit
(SPORT ABS (2JZ-GTE Engine) only)
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-
tions abnormally, the ABS warning light comes on but the ABS still operates.
DTC No.
DTC Detecting Condition
Trouble Area
44
Either of the following (1), (2) or (3) is detected:
(1) IG switch ON and output voltage of GL1 or GL2 remains
0.5 V or less or 4.5 V or more for more than 1.2 sec.
(2) At vehicle speed of 0 km/h, outputs of GL1 and GL2 re-
mains abnormally different for 60 sec. or more
(3) IG switch ON and VGS
4.4 V, VGS
5.5 V continues
for 1.2 sec. or more.
Deceleration sensor
Open or short in deceleration sensor circuit
WIRING DIAGRAM
DI4VH-01
F02629
F03339
F03340
ON
GL1
VGS
GL2
(+)
(-)
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-481
709
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check for open and short in harness and connector between sensor and ABS
ECU (See page
NG
Repair or replace harness or connector.
OK
2
Check voltage between terminals GL1, GL2, VGS of ECU and body ground.
PREPARATION:
(a)
Remove ABS ECU with connectors still connected.
(b)
Disconnect sensor connector.
(c)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals GL1, GL2, VGS of ECU
and body ground.
OK:
Voltage:
GL1, GL2: 0.5 - 4.5 V
VGS: 4.5 - 5.5 V
NG
Check and replace ABS ECU.
OK
Check and replace deceleration sensor.
F03341
R/B No.2
J/B No.1
Stop Light
Switch
ABS ECU
12
5
Light
Failure
Sensor
Stop Light
J/B
No.1
1
10
IH
IC
A18 A22
*1
*2
G-W
G-W
G-W
1
2
W
STOP
2
10
1B
1I
W-L
POWER
2
2
W
2
2A
AL
T
R/B No.2
B
Battery
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JS-GTE Engine)
*1:
*2:
1
DI-482
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
710
Author:
Date:
1997 SUPRA (RM502U)
DTC
49
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
This stop light switch senses whether the brake pedal is depressed or released, and sends a signal to the
ECU.
DTC No.
DTC Detecting Condition
Trouble Area
49
1.2 - 1.7 V of STP voltage is continued for 0.3 sec. or more.
Open in stop light circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG
Replace stop light bulb.
OK
DI4VI-01
F03342
F03343
F03344
NORMAL ABS (2JZ-GE Engine):
SPORT ABS (2JZ-GTE Engine):
V
(+)
(-)
(+)
(-)
STP
STP
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-483
711
Author:
Date:
1997 SUPRA (RM502U)
2
Check voltage between terminal STP of ABS ECU and body ground.
PREPARATION:
Remove ABS ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of ABS ECU and body
ground when brake pedal is depressed.
OK:
Voltage: 8 - 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms chart (See page
).
NG
3
Check for open in harness and connector between ABS ECU and stop light
switch (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace ABS ECU.
DI-484
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
712
Author:
Date:
1997 SUPRA (RM502U)
DTC
51
ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
51
Pump motor is not operating normally during initial check.
ABS pump motor
Fail safe function:
If trouble occurs in the ABS pump motor, the ECU cuts off the current to the ABS solenoid relay and prohibits
ABS control.
WIRING DIAGRAM
See page
INSPECTION PROCEDURE
See inspection of ABS actuator (See page
).
DI4VJ-01
F03345
R/B No.2
ABS ECU
*1
*2
W
2
1B
2
2
B
Battery
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JZ-GTE Engine)
*1:
*2:
ALT
W
R/B No.2
J/B No.1
2
AM1
W
1J
4
4
2
IG Switch
4
B-Y
J/B No.1
1J
1K
ECU-IG
5
13
A18 A20
2
13
2
12
13
25
IG 1
GND1
GND2
A20
A20
A19
A19
W-B
W-B
W-B
W-B
W-B
*2
IE
IG
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-485
713
Author:
Date:
1997 SUPRA (RM502U)
DTC
Always ON
Malfunction in ECU IG Power Source
Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU, and the actuators.
DTC No.
DTC Detecting Condition
Trouble Area
Always ON
Voltage of ECU terminal IG1 remains at more than 17 V for 1
sec. or more.
Battery
IC regulator
Open or short in power source circuit
ECU
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
WIRING DIAGRAM
DI4VK-01
DI-486
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
714
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Is DTC output?
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
2
Is normal code displayed?
YES
Check ABS solenoid relay. Check for short in
harness and connector between ABS solenoid
relay and DLC1 (See page
).
NO
3
Is ABS warning light go off?
YES
Check for open or short in harness and conec-
tor between ECU-IG Fuse and ECU
(See page
).
NO
4
Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 16 V
NG
Check and repair the charging system.
OK
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-487
715
Author:
Date:
1997 SUPRA (RM502U)
5
Check ABS warning light.
PREPARATION:
(a)
Turn the ignition switch OFF.
(b)
Disconnect the conector from the ABS ECU.
(c)
Turn the ignition switch ON.
CHECK:
Check the ABS warning light goes off.
OK
Check and replace ABS ECU.
NG
Check for short in harness and connector between combination meter and ABS ECU, combina-
tion meter and DLC1 (See page
F03346
F03347
F03348
2JZ-GE Engine (NORMAL ABS):
2JZ-GTE Engine (SPORT ABS):
Battery
ABS Control Relay
J/B No.1
(Motor
Relay)
(Solenoid
Relay)
W-B
1
2
6
A9
4
3
1
4
A9
B-R
EA1
6
23
B-R
22
DLC1
Short Pin
L
16
IJ1
A18
4
L
L
L
IF2
12
L
4
2
ABS
Warning
Light
Y
GAUGE
ABS ECU
1J
1E
5
12
2
5
ABS Actuator
ABS ECU
12 V
WA
EA
Battery
R/B No.5
ABS
Solenoid Relay
1
5
5
5
5
5
5
2
6
4
5
3
W-B
EA
ABS Actuator
B-R
EA1
6
23
B-R
Short Pin
DLC1
22
L
16
IJ1
L
L
L
11
A20
WA
12 V
ABS ECU
ABS
Warning
Light
L 4
IF2
12
2
Y
GAUGE
J/B No.1
1J
1E
12
5
ABS & TRAC
ECU
DI-488
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
716
Author:
Date:
1997 SUPRA (RM502U)
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control. At
this time, the ECU records a DTC in memory.
After removing the short pin of the DLC1, connect terminals Tc and E1 of the DLC1 or DLC2 to make the
ABS warning light to blink and output the DTC.
WIRING DIAGRAM
DI4VL-01
F02629
F03349
F03350
LOCK
Open
Continuity
A8
A9
Continuity
F02629
F03351
F03352
Open
Continuity
A8
A9
(+)
(-)
LOCK
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-489
717
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
2JZ-GE Engine:
Troubleshooting in accordance with the chart below for each trouble symptom.
ABS warning light does not light up
Go to step 1
ABS warning light remains on
1
Check ABS warning light.
See Combination Meter Troubleshooting on page
.
NG
Replace bulb or combination meter assembly.
OK
2
Check ABS control (solenoid) relay.
PREPARATION:
Disconnect the connectors from ABS control (solenoid) relay.
CHECK:
Check continuity between each terminal of ABS control (sole-
noid) relay.
OK:
Terminals A9 - 1 and A8 - 3
Continuity (Reference value 80
Ω
)
Terminals A9 - 5 and A9 - 6
Continuity
Terminals A9 - 2 and A9 - 5
Open
CHECK:
(a)
Apply battery positive voltage between terminals A9 - 1
and A8 - 3.
(b)
Check continuity between each terminal of ABS solenoid
relay.
OK:
Terminals A9 - 5 and A9 - 6
Open
Terminals A9 - 2 and A9 - 5
Continuity
F02629
F03353
F03354
LOCK
(+)
(-)
A9
DI-490
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
718
Author:
Date:
1997 SUPRA (RM502U)
CHECK:
Connect the
test lead to terminal A9 - 4 and the
lead to
terminal A9 - 5. Check continuity between terminals.
OK:
Continuity
If there is no continuity, connect the
test lead to terminal A9
- 4 and the
lead to terminal A9 - 5. Recheck continuity be-
tween terminals.
NG
Replace ABS control relay.
OK
Repair or replace and check for open in harness and connector between DLC1 and ABS control
(solenoid) relay and body ground (See page
3
Is DTC output?
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
4
Does ABS warning light go off if short pin is removed?
NO
Check for short in harness and connector be-
tween warning light and DLC1 and ECU (See
page
YES
F02629
F03355
F03356
LOCK
Open
Continuity
Continuity
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-491
719
Author:
Date:
1997 SUPRA (RM502U)
5
Check ABS control (solenoid) relay (See step No.2).
NG
Replace ABS control relay.
OK
Repair or replace and check for short in harness and connector between DLC1 and ABS control
(solenoid) relay (See page
2JZ-GTE Engine:
Troubleshoot in accordance with the chart below for each trouble symptom.
ABS warning light does not light up
Go to step 1
ABS warning light remains on
1
Check ABS warning light.
See combination meter troubleshooting on page
NG
Replace bulb or combination meter assembly.
OK
2
Check ABS solenoid relay.
PREPARATION:
Remove solenoid relay from R/B No.5.
CHECK:
Check continuity between each terminal of ABS solenoid relay.
OK:
Terminals 4 and 6
Continuity (Reference value 80
Ω
)
Terminals 2 and 3
Continuity
Terminals 1 and 3
Open
F02629
F03357
F03358
LOCK
Open
Continuity
(-)
(+)
F02629
F03359
F03360
LOCK
(-)
(+)
6
4
1
2
DI-492
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
720
Author:
Date:
1997 SUPRA (RM502U)
CHECK:
(a)
Apply battery positive voltage between terminals 4 and 6.
(b)
Check continuity between each terminal of ABS solenoid
relay.
OK:
Terminals 2 and 3
Open
Terminals 1 and 3
Continuity
CHECK:
Connect the
test lead to terminal 5 and the
lead to terminal
3. Check continuity between the terminals.
OK:
Continuity
If there is not continuity, connect the
test lead to terminal 5
and the
lead to terminal 3. Recheck continuity between ter-
minals.
NG
Replace ABS solenoid relay.
OK
Repair or replace and check for open in harness and connector between DLC1 and ABS solenoid
relay and body ground (See page
3
Is DTC output?
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-493
721
Author:
Date:
1997 SUPRA (RM502U)
4
Does ABS warning light go off if short pin is removed?
NO
Check for short in harness and connector be-
tween warning light and DLC1 and ECU (See
page
YES
5
Check ABS solenoid relay (See step No.2).
NG
Replace ABS control relay.
OK
Repair or replace and check for short in harness and connector between DLC1 and ABS solenoid
relay (See page
F03361
ABS ECU
12 V
Tc
A20
A19
9
8
*1
*2
R
R
R
IF1
11
P-B
II1
DLC1
R
*1
21
*2
P-B
R
*1
*2
DLC2
11
Tc
E
1
3
BR
BR
BR
ED
IJ1
18
BR
Tc
E
1
3
4
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JZ-GTE Engine)
*1:
*2:
S−17−1 Iei−23−1−A
F00041
DLC2
DLC1
E1
Tc
E1
Tc
DI-494
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
722
Author:
Date:
1997 SUPRA (RM502U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and E1 of the DLC1 or the DLC1 or the DLC2 causes the ECU to display the DTC
by flashing the ABS warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminals Tc and E1 of DLC2 or DLC1.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC2 or
DLC1.
OK:
Voltage: 10 - 14 V
OK
If ABS warning light does not blink even after Tc
and E1 are connected, the ECU may be defec-
tive.
NG
DI4VM-01
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-495
723
Author:
Date:
1997 SUPRA (RM502U)
2
Check for open and short in harness and connector between ABS ECU and
DLC2 or DLC1, DLC2 or DLC1 and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace ABS ECU.
F03362
ABS ECU
Ts
8
*1
*2
IJ1
DLC1
21
15
BR
ED
Tc
E
1
3
16
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JZ-GTE Engine)
*1:
*2:
Y
Y
12 V
A18 A20
F00007
lei-23-1-A
E1
Ts
DLC1
DI-496
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
724
Author:
Date:
1997 SUPRA (RM502U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and E1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminals Ts and E1 of DLC1.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Ts and E1 of DLC1.
OK:
Voltage: 10 - 14 V
OK
If ABS warning light does not blink even after Ts
and E1 are connected, the ECU may be defec-
tive.
NG
DI4VN-01
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
DI-497
725
Author:
Date:
1997 SUPRA (RM502U)
2
Check for open and short in harness and connector between ABS ECU and
DLC1, DLC1 and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace ABS ECU.
F03363
DI-498
-
DIAGNOSTICS
ANTI-LOCK BRAKE SYSTEM
726
Author:
Date:
1997 SUPRA (RM502U)
Check for Fluid Leakage
Check for fluid leakage from actuators or hydraulic lines.
DI4VO-01
DI4VP-01
Vehicle Brought to Workshop
Customer Problem Analysis
P.
Check and Clear DTC (Precheck)
P.
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom Confirmation
Symptom Simulation
P.
Symptom
does not occur
Symptom
occurs
DTC Check
P.
Sensor Check
Circuit Inspection
DTC Chart
P.
Malfunction code
Problem Symptoms Chart
P.
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
6
7
8
9
10
11
Step 9: Diagnostic steps permitting the use of the
TOYOTA hand-held tester.
-
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-499
727
Author:
Date:
1997 SUPRA (RM502U)
ABS & TRACTION CONTROL SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.
DI4VQ-01
TRAC Check Sheet
Inspector’s
Name
:
Customer’s Name
Date Vehicle
Brought In
Registration Year
Registration No.
Frame No.
Odometer Reading
/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs
/ /
Continuous
Intermittent ( times a day)
DTC Check
1st Time
2nd Time
Normal Code
Malfunction Code (Code )
Normal Code
Malfunction Code (Code )
km
miles
Check Item
Normal
Malfunction
Indicator Light
Malfunction Code (Code )
TRAC does not operate. (Wheels spin when starting rapidly.)
Symptoms
TRAC OFF Indicator
Light Abnormal
SLIP Indicator
Light Abnormal
Remains ON
Blinks
Does not Light Up
Remains ON
Does not Light Up
Remains ON
Does not Light Up
Snow Indicator
Light Abnormal
DI-500
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
728
Author:
Date:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK
DI4VR-01
W02267
F03365
ON
OFF
0.5
sec.
1.5
sec.
S−17−1 F02201
F03525
DLC2
DLC1
E
1
Tc
Tc
E
1
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-501
729
Author:
Date:
1997 SUPRA (RM502U)
PRE-CHECK
1.
DIAGNOSIS SYSTEM
(a)
Check the indicator.
When the ignition switch is turned ON, check that the
TRAC OFF indicator light goes on, and when the engine
is started, check that the TRAC OFF indicator light goes
off.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the TRAC OFF indicator light circuit (See page
(b)
Check the DTC.
(1)
Turn the ignition switch ON.
If the ECU stores DTC, the TRAC OFF indicator light blinks after
lighting up for 3 seconds.
The blinking pattern is shown on the left.
(2)
Using SST, connect terminals Tc and E
1
of DLC2 or
DLC1.
SST
09843-18020
R01346
Normal Code
2 sec.
0.25
sec.
0.25
sec.
ON
OFF
Code 11 and 21
ON
OFF
0.5 sec.
2.5 sec.
4.5 sec.
1.5
sec.
0.5 sec.
Code 11
Code 21
F03366
ECU-B
J/B No.1
DI-502
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
730
Author:
Date:
1997 SUPRA (RM502U)
(3)
Read the DTC from the TRAC OFF indicator light on
the combination meter.
HINT:
If no code appears, inspect the diagnostic circuit or TRAC
OFF indicator light circuit (See page
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(4)
Codes are explained in the code table on page
(5)
After completing the check, disconnect terminals Tc
and E1, and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.
(c)
Clear the DTC.
(1)
Remove the ECU-B fuse from the J/B No.1 for 10
sec. or more.
(2)
Install the ECU-B fuse.
(3)
Confirm that the TRAC OFF indicator light shows
the normal code.
DI4VS-01
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-503
731
Author:
Date:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843-18020, connect the terminals Tc and E
1
.
If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, turn to the page referred to under the ”See page” for the respective ”DTC No.” in the DTC chart.
DTC No.
(See Page)
Detection Item
Trouble Area
11
(
)
Throttle control relay circuit open
Throttle control relay
TRAC fuse
Wire harness and connector (throttle control relay circuit)
Throttle control ECU
12
(
)
Throttle control relay circuit short
Throttle control relay
Wire harness and connector (throttle control relay circuit)
Throttle control ECU
21
(
)
Sub-throttle valve motor circuit open or short
Sub-throttle valve motor
Wire harness and connector (sub-throttle valve motor and
E01 circuit)
Throttle control ECU
22
(
)
Sub-throttle valve motor malfunction
Sub-throttle valve motor
Sub-throttle valve
Sub-throttle position sensor
Wire harness and connector (E1 circuit)
Throttle control ECU
23
(
)
Throttle body malfunction
Sub-throttle valve
Sub-throttle position sensor
Throttle control ECU
24
(
)
Sub-throttle position sensor leakage/sub-throttle valve stuck
Sub-throttle valve
Sub-throttle position sensor
Wire harness and connector (E1 circuit)
Throttle control ECU
31
(
)
Throttle position sensor signal malfunction
Throttle position sensor
Wire harness and connector (throttle position senor and E1
circuit)
Throttle control ECU
32
(
)
Sub-throttle position sensor signal malfunction
Sub-throttle position sensor
Sub-throttle valve motor
Sub-throttle valve
Wire harness and connector (sub-throttle position senor and
E1 circuit)
Throttle control ECU
41
(
)
Engine revolution signal open or short
Wire harness and connector (NE circuit)
ECM
Throttle control ECU
42
(
)
ECM malfunction
Wire harness and connector (EFIF circuit)
ECM
Throttle control ECU
43
(
)
ECM communication circuit malfunction
Wire harness and connector (EFI+ and EFI- circuit)
ECM
Throttle control ECU
51
(
)
Power source voltage down
(sub-throttle valve in a bad condition)
Wire harness and connector (+B and E01 circuit)
Throttle control ECU
DI-504
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
732
Author:
Date:
1997 SUPRA (RM502U)
52
(
)
Power source voltage down
Battery
IC regulator
Wire harness and connector (+B and E01 circuit)
Throttle control ECU
61
(
)
Right front speed sensor circuit
62
(
)
Left front speed sensor circuit
Right front, left front, right rear and left rear speed sensor
Wire harness and connector (FRO, FLO, RRO and RLO
63
(
)
Right rear speed sensor circuit
Wire harness and connector (FRO, FLO, RRO and RLO
circuit)
Throttle control ECU
64
(
)
Left rear speed sensor circuit
71
(
)
Emergency fuel cut (sub-throttle motor circuit malfunction)
Sub-throttle valve motor
S b th ttl
l
72
(
)
Emergency fuel cut
Sub-throttle valve
Throttle control ECU
81
(
)
ABS ECU malfunction
Wire harness and connector (WA circuit)
ABS ECU
Throttle control ECU
Always ON
Throttle control ECU malfunction
TRAC OFF switch ON
Throttle control ECU
DI4VT-01
W02272
Rear Speed Sensor Rotor
SLIP Indicator Light
TRAC OFF Indicator Light
SNOW Indicator Light
Throttle Control Relay
(TRAC Solenoid Relay)
TRAC OFF
Switch
SNOW Mode
Switch
ABS ECU
ECM
Throttle Control ECU
DLC1
Throttle Position Sensor
Sub-throttle
Position Sensor
Front Speed Sensor Rotor
Sub-throttle Valve Motor
Front Speed Sensor
Front Speed Sensor Rotor
Rear Speed Sensor
DLC2
Front Speed Sensor
-
DIAGNOSTICS
ABS &
TRACTION CONTROL
SYSTEM
DI-505
733
Author:
Date:
1997
SUPRA (RM502U)
P
ARTS
LOCA
TION
DI7HK-01
R00463
13 12 11
26
25 24 23 22
21 20 19
18 17
16
15 14
16 15 14 13 12 11 10
9
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
10
Throttle Contrl ECU
T15
T16
DI-506
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
734
Author:
Date:
1997 SUPRA (RM502U)
TERMINALS OF ECU
Symbols (Terminal No.)
STD Voltage (V)
Condition
BATT (T16-1) - E1 (T15-26)
9 - 14
Always
+B (T16-9) - E1 (T15-26)
9 - 14
IG switch ON, Engine stops
EFIB (T15-1) - E1 (T15-26)
9 - 14
IG switch ON, Engine stops
IDL1 (T15 4)
E1 (T15 26)
0 - 3
IG switch ON, Throttle valve fully closed
IDL1 (T15-4) - E1 (T15-26)
9 - 14
IG switch ON, Throttle valve fully open
VTA1 (T15 6)
E1 (T15 26)
0.3 - 0.8
IG switch ON, Throttle valve fully closed
VTA1 (T15-6) - E1 (T15-26)
3.2 - 4.9
IG switch ON, Throttle valve fully open
IDL2 (T15 3)
E1 (T15 26)
0 - 3
Engine running, Sub-throttle valve fully closed
IDL2 (T15-3) - E1 (T15-26)
9 - 14
Engine running, Sub-throttle valve fully open
VTA2 (T15 19)
E1 (T15 26)
0.3 - 0.8
Engine running, Sub-throttle valve fully closed
VTA2 (T15-19) - E1 (T15-26)
3.2 - 4.9
Engine running, Sub-throttle valve fully open
FRO (T16-16) - E1 (T15-26)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
FLO (T16-8) - E1 (T15-26)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
RRO (T16-15) - E1 (T15-26)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
RLO (T16-7) - E1 (T15-26)
Pulse generation
Vehicle driving at about 30 km/h (19 mph)
WT (T16 10)
E1 (T15 26)
0 - 3
IG switch ON, TRAC OFF indicator light ON
WT (T16-10) - E1 (T15-26)
9 - 14
IG switch ON, TRAC OFF indicator light OFF
IND (T16 2)
E1 (T15 26)
0 - 3
IG switch ON, SLIP indicator light ON
IND (T16-2) - E1 (T15-26)
9 - 14
IG switch ON, SLIP indicator light OFF
CSW (T16 6)
E1 (T15 26)
0 - 3
IG switch ON, TRAC OFF switch holded on pushing
CSW (T16-6) - E1 (T15-26)
9 - 14
IG switch ON, TRAC OFF switch released
RLY+ (T16-4) - RLY- (T16-12)
9 - 14
IG switch ON
SIND (T16 11)
E1 (T15 26)
0 - 3
IG switch ON, SNOW indicator light ON
SIND (T16-11) - E1 (T15-26)
9 - 14
IG switch ON, SNOW indicator light OFF
SNOW (T16 14)
E1 (T15 26)
0 - 3
IG switch ON, SNOW mode switch holded on pushing
SNOW (T16-14) - E1 (T15-26)
9 - 14
IG switch ON, SNOW mode switch released
A (T15-12) - E01 (T15-13)
Pulse generation
Engine running, Throttle valve fully closed
A (T15-11) - E01 (T15-13)
Pulse generation
Engine running, Throttle valve fully closed
B (T15-25) - E01 (T15-13)
Pulse generation
Engine running, Throttle valve fully closed
B (T15-24) - E01 (T15-13)
Pulse generation
Engine running, Throttle valve fully closed
NE (T15-16) - E1 (T15-26)
Pulse generation
Idling
FAIL (T15 9)
E1 (T15 26)
Pulse generation
IG switch ON (normal condition)
FAIL (T15-9) - E1 (T15-26)
9 - 14
IG switch ON (abnormal condition)
EFIF (T15 17)
E1 (T15 26)
0 - 2
IG switch ON, ECM normal condition
EFIF (T15-17) - E1 (T15-26)
4.5 - 5.5
IG switch ON, ECM abnormal condition
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-507
735
Author:
Date:
1997 SUPRA (RM502U)
EFI+ (T15-7) - E1 (T15-26)
Pulse generation
IG switch ON
EFI- (T15-20) - E1 (T15-26)
Pulse generation
IG switch ON
ETC+ (T15-8) - E1 (T15-26)
Pulse generation
IG switch ON
ETC- (T15-21) - E1 (T15-26)
Pulse generation
IG switch ON
TC (T16-3) - E1 (T15-26)
4.5 - 5.5
IG switch ON, Engine stops
WA (T16 5)
E1 (T15 26)
9 - 14
IG switch ON, ABS ECU normal condition
WA (T16-5) - E1 (T15-26)
0 - 3
IG switch ON, ABS ECU abnormal condition
DI4VV-01
DI-508
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
736
Author:
Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
Symptom
Inspection Circuit
See page
TRAC does not operate.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring,replace the throttle control ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. Power source circuit.
3. Speed sensor circuit.
SLIP indicator light
abnormal.
SLIP indicator light circuit.
SNOW indicator light
abnormal.
1. SNOW indicator light circuit.
2. SNOW made switch circuit.
TRAC OFF indicator light
abnormal.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring,replace the throttle control ECU.
1. TRAC OFF indicator light circuit.
2. TRAC OFF switch circuit.
DTC check cannot be done.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring,replace the throttle control ECU.
1. TRAC OFF indicator light circuit.
2. Tc terminal circuit.
DI4VW-01
F03368
Throttle Control
ECU
R/B No.5
Throttle Control Relay
(TRAC Solenoid Relay)
R/B
No.2
Battery
+B
RLY-
RLY+
E01
9
12
4
13
BR
L-B
BR-B
L-R
14
11
12
L-B
L-Y
L-R
BR-B
B
2
1 2A
5
4
2
1
3
IB5
T16
T15
EC
5
1
6
5
5
IB5
IB5
T16
T16
TRAC
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-509
737
Author:
Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC
11, 12
Throttle Control Relay Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
11
Instead of throttle control relay is ON, voltage at +B of ECU
terminal does not output 4 V or more for 1 sec. or more.
Throttle control relay
TRAC fuse
Wire harness and connector (throttle control relay circuit)
Throttle control ECU
12
Instead of throttle control relay is OFF, voltage at +B of ECU
terminal outputs 4 V or more for 2 sec. or more.
Throttle control relay
Wire harness and connector (throttle control relay circuit)
Throttle control ECU
WIRING DIAGRAM
F03369
R/B No.2
TRAC
F03370
BE6053
F06762
LOCK
R/B No.5
(-)
(+)
DI-510
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
738
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check TRAC fuse.
PREPARATION:
Remove TRAC fuse from R/B No.2.
CHECK:
Check continuity of TRAC fuse.
OK:
Continuity
NG
Check for short in all harness and components
connected to TRAC fuse.
OK
2
Check voltage between terminal 1 of R/B No.5 (for throttle control relay).
PREPARATION:
Remove throttle control relay from P/B No.5.
CHECK:
Measure voltage between terminal 1 of R/B No.5 (for throttle
control relay).
OK:
Voltage: 10 - 14 V
NG
Repair or replace harness or connector.
OK
F03372
F03373
F03374
F03375
3
6
1
4
Open
Continuity
Continuity
3
1
4
6
1
3
6
4
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-51 1
739
Author:
Date:
1997 SUPRA (RM502U)
3
Check throttle control relay.
PREPARATION:
Remove throttle control relay from R/B No.5
CHECK:
Check continuity between each terminal of throttle control relay.
OK:
Terminals 4 and 6
Continuity (Reference value 80
Ω
)
Terminals 1 and 3
Open
CHECK:
(a)
Apply battery voltage between terminals 4 and 6.
(b)
Check continuity between terminals.
OK:
Terminals 1 and 3
Continuity
NG
Replace throttle control relay.
OK
DI-512
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
740
Author:
Date:
1997 SUPRA (RM502U)
4
Check for open and short in harness and connector between throttle control
relay and throttle control ECU (See page
NG
Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
F03376
ECM
VTO2
IDL2
Sub-throttle
Position Sensor
39
E10
E9
63
GR-R
G-O
T15
19
GR-R
GR-R
3
T15
26
T15
BR
12V
VTA2
12V
12V
GE01
E01
B
B
A
A
12V
12V
12
T15
T15
25
T15
T15
23
T15
13
T15
W-B
(Shielded)
L
Y
R
B
Sub- throttle
Valve Motor
6
4
3
1
2
ED
EC
IDL2
E1
11
24
Throttle Control ECU
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-513
741
Author:
Date:
1997 SUPRA (RM502U)
DTC
21, 22
Sub-Throttle Valve Motor Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
21
Sub-throttle valve motor circuit is open or short.
Sub-throttle valve motor
Wire harness and connector (sub-throttle valve motor and
E01 circuit)
Throttle control ECU
22
In case the sub-throttle valve open angle is tilted.
Sub-throttle valve motor
Sub-throttle valve
Sub-throttle position senor
Wire harness and connector (E1 circuit)
Throttle control ECU
WIRING DIAGRAM
DI4VX-01
F03377
3
6
4
1
F03378
BE6653
F03379
F03380
ON
IDL2
DI-514
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
742
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check sub-throttle valve motor.
PREPARATION:
Disconnect sub-throttle valve motor connector.
CHECK:
Check continuity between each terminal of sub-throttle valve
motor connector.
OK:
Terminals 1 and 3
Continuity
Terminals 4 and 6
Continuity
(Reference value 0.40 - 0.48
Ω
)
NG
Replace sub-throttle valve motor.
OK
2
Check voltage between terminal IDL2 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Remove intake air duct.
(c)
Disconnect sub-throttle valve motor connector.
(d)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve position
Voltage
Fully closed
0 - 3 V
Fully open
9 - 14 V
OK
Go to step 4.
NG
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-515
743
Author:
Date:
1997 SUPRA (RM502U)
3
Check for open and short in harness and connector between terminal IDL2 of
throttle control ECU and sub-throttle position sensor (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
4
Check sub-throttle position sensor (See page
NG
Adjust or replace sub-throttle position sensor
(See page SF-44).
OK
5
Check for open and short in harness and connector between terminals E01, E1
of throttle control ECU and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03376
ECM
VTO2
IDL2
Sub-throttle
Position Sensor
39
E10
E9
63
GR-R
G-O
T15
19
GR-R
GR-R
3
T15
26
T15
BR
12V
VTA2
12V
12V
GE01
E01
B
B
A
A
12V
12V
12
T15
T15
25
T15
T15
23
T15
13
T15
W-B
2
ED
EC
IDL2
E1
11
24
Throttle Control ECU
(SHIELDED)
L
Y
R
B
Sub- throttle
Valve Motor
6
4
3
1
DI-516
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
744
Author:
Date:
1997 SUPRA (RM502U)
DTC
23
Throttle Body Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
23
In case the sub-throttle valve is fully open or full close angle
become smaller.
Sub-throttle valve
Sub-throttle position senor
Throttle control ECU
WIRING DIAGRAM
DI4VY-01
F03378
BE6653
F03379
F03380
ON
IDL2
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-517
745
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminal IDL2 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Remove intake air duct.
(c)
Disconnect sub-throttle valve motor connector.
(d)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve position
Voltage
Fully closed
0 - 3 V
Fully open
9 - 14 V
OK
Go to step 3.
NG
2
Check for open and short in harness and connector between terminal IDL2 of
throttle control ECU and sub-throttle position sensor (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
DI-518
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
746
Author:
Date:
1997 SUPRA (RM502U)
3
Check sub-throttle position sensor (See page
NG
Adjust or replace sub-throttle position sensor
(See page SF-44).
OK
Check and replace throttle control ECU.
F03376
ECM
VTO2
IDL2
Sub-throttle
Position Sensor
39
E10
E9
63
GR-R
G-O
T15
19
GR-R
GR-R
3
T15
26
T15
BR
12V
VTA2
12V
12V
GE01
E01
B
B
A
A
12V
12V
12
T15
T15
25
T15
T15
23
T15
13
T15
W-B
(Shielded)
L
Y
R
B
Sub- throttle
Valve Motor
6
4
3
1
2
ED
EC
IDL2
E1
11
24
Throttle Control ECU
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-519
747
Author:
Date:
1997 SUPRA (RM502U)
DTC
24
Sub-Throttle Position Sensor Leakage/
Sub-Throttle Valve Stuck
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
24
Instead of sub-throttle valve motor is driven fully open, voltage
at VTA2 of ECU terminal does not output 3.2 V to 4.9 V or
more.
Sub-throttle valve
Sub-throttle position senor
Wire harness and connector (E1 circuit)
Throttle control ECU
WIRING DIAGRAM
DI4VZ-01
F03378
BE6653
F03382
F03383
ON
(-)
VTA2
(+)
DI-520
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
748
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminal VTA2 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Remove intake air duct.
(c)
Disconnect sub-throttle valve motor connector.
(d)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal VTA2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve position
Voltage
Fully closed
0.3 - 0.8 V
Fully open
3.2 - 4.9 V
OK
Go to step 3.
NG
2
Check for open and short in harness and connector between terminal VTA2 of
throttle control ECU and terminal VTO2 of ECM (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
3
Check sub-throttle position sensor (See page
NG
Adjust or replace sub-throttle position sensor
(See page SF-44).
OK
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-521
749
Author:
Date:
1997 SUPRA (RM502U)
4
Check for open and short in harness and connector between terminal E1 of
throttle control ECU and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03384
Throttle
Control
ECU
VTA1
12V
IDL1
E1
T15
T15
T15
6
4
26
BR
R
V-Y
3
R
R
E10
40
E9
64
VTO1
IDL1
ECM
ED
Throttle Position Sensor
DI-522
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
750
Author:
Date:
1997 SUPRA (RM502U)
DTC
31
Throttle Position Sensor Circuit
CIRCUIT DESCRIPTION
This circuit is not directly related to the TRAC control, but as it has an influence on TRAC control when trouble
occurs in this circuit, it is used to switch off the TRAC system as a fail safe function.
DTC No.
DTC Detecting Condition
Trouble Area
31
Throttle position sensor circuit is open circuit and E1 or +B
circuit is short for 0.5 sec. or more.
Throttle position senor
Wire harness and connector (throttle position sensor and E1
circuit)
Throttle control ECU
WIRING DIAGRAM
DI4W0-01
F03385
BE6653
F03386
F03387
ON
IDL1
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-523
751
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
The main throttle position sensor signal is transmitted to the throttle control ECU from ECM, so if an error
occurs at the engine side, the throttle control ECU also detects it.
If DTC No. P0120 or P0121 is being output for the engine, troubleshoot the engine first.
1
Is DTC output for the engine?
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
2
Check voltage between terminal IDL1 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Disconnect the vacuum hose from the throttle opener,
and apply vacuum to the throttle opener.
(c)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL1 of throttle control ECU
and body ground, when the throttle valve is fully closed and fully
open.
OK:
Throttle valve position
Voltage
Fully closed
0 - 3 V
Fully open
9 - 14 V
OK
Go to step 4.
NG
F03385
BE6653
F03388
F03389
ON
VTA1
DI-524
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
752
Author:
Date:
1997 SUPRA (RM502U)
3
Check for open and short in harness and connector between terminal IDL1 of
throttle control ECU and throttle position sensor (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
4
Check voltage between terminal VTA1 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Disconnect the vacuum hose from the throttle opener,
and apply vacuum to the throttle opener.
(c)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal VTA1 of throttle control ECU
and body ground, when the throttle valve is fully closed and fully
open.
OK:
Throttle valve position
Voltage
Fully closed
0.3 - 0.8 V
Fully open
3.2 - 4.9 V
OK
Go to step 6.
NG
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-525
753
Author:
Date:
1997 SUPRA (RM502U)
5
Check for open and short in harness and connector between terminals VTA1 of
throttle control ECU and VTO1 of ECM (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
6
Check throttle position sensor (See page SF-44).
NG
Adjust or replace throttle position sensor
(See page SF-44).
OK
7
Check for open and short in harness and connector between terminal E1 of
throttle control ECU and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03376
ECM
VTO2
IDL2
Sub-throttle
Position Sensor
39
E10
E9
63
GR-R
G-O
T15
19
GR-R
GR-R
3
T15
26
T15
BR
12V
VTA2
12V
12V
GE01
E01
B
B
A
A
12V
12V
12
T15
T15
25
T15
T15
23
T15
13
T15
W-B
(Shielded)
L
Y
R
B
Sub- throttle
Valve Motor
6
4
3
1
2
ED
EC
IDL2
E1
11
24
Throttle Control ECU
DI-526
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
754
Author:
Date:
1997 SUPRA (RM502U)
DTC
32
Sub-Throttle Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the opening angle of the sub-throttle valve and sends the appropriate signals to the
ECU. If a trouble signal is input, the ECU prohibits TRAC control.
DTC No.
DTC Detecting Condition
Trouble Area
32
Conditions (1) and (2) continue for 0.5 sec. or more:
(1) Sub-throttle position sensor circuit is open and E1 or +B
circuit is short.
(2) Instead of sub-throttle valve motor is driven fully close,
IDL2 of sub-throttle position sensor will not come ON.
Sub-throttle position senor
Sub-throttle valve motor
Sub-throttle valve
Wire harness and connector (sub-throttle position sensor
and E1 circuit)
Throttle control ECU
WIRING DIAGRAM
DI4W1-01
F03378
BE6653
F03379
F03380
ON
IDL2
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-527
755
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
The sub-throttle position sensor signal is transmitted to the throttle control ECU from ECM, so if an error
occurs at the engine side, the throttle control ECU also detects it.
If DTC No. P1400 or P1401 is being output for the engine, troubleshoot the engine first.
1
Is DTC output for the engine?
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
2
Check voltage between terminal IDL2 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Remove intake air duct.
(c)
Disconnect sub-throttle valve motor connector.
(d)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve position
Voltage
Fully closed
0 - 3 V
Fully open
9 - 14 V
OK
Go to step 4.
NG
3
Check for open and short in harness and connector between terminal IDL2 of
throttle control ECU and sub-throttle position sensor (See page
).
NG
Repair or replace harness or connector.
OK
F03378
BE6653
F03382
F03383
ON
VTA2
(-)
(+)
DI-528
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
756
Author:
Date:
1997 SUPRA (RM502U)
4
Check voltage between terminal VTA2 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Remove intake air duct.
(c)
Disconnect sub-throttle valve motor connector.
(d)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal VTA2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve position
Voltage
Fully closed
0.3 - 0.8 V
Fully open
3.2 - 4.9 V
OK
Go to step 6.
NG
5
Check for open and short in harness and connector between terminals VTA2 of
throttle control ECU and VTO2 of ECM (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
6
Check sub-throttle position sensor (See page
NG
Adjust or replace sub-throttle position sensor
(See page SF-44).
OK
F03377
6
3
1
4
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-529
757
Author:
Date:
1997 SUPRA (RM502U)
7
Check sub-throttle valve motor.
PREPARATION:
Disconnect sub-throttle valve motor connector.
CHECK:
Check continuity between each terminal of sub-throttle valve
motor connector.
OK:
Terminals 1 and 3
Continuity
Terminls 4 and 6
Continuity
(Reference value 0.40 - 0.48
Ω
)
NG
Replace sub-throttle valve motor.
OK
8
Check for open and short in harness and connector between terminal E1 of
throttle control ECU and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
BR5440
Throttle Control ECU
5V
NE
T15
16
P-L
38
E10
NEO
ECM
DI-530
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
758
Author:
Date:
1997 SUPRA (RM502U)
DTC
41
NE Signal Circuit
CIRCUIT DESCRIPTION
The throttle control ECU receives engine speed signals (NE signals) from the ECM.
DTC No.
DTC Detecting Condition
Trouble Area
41
While engine is running, throttle control ECU detected 0 rpm
signal for 0.8 sec. or more.
Wire harness and connector (NE circuit)
ECM
Throttle control ECU
WIRING DIAGRAM
DI4W2-01
BE6653
F03391
F03392
ON
NE
(Reference)
3 - 6 V
Below 1V
3 ms. 3 ms.
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-531
759
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
If DTC No. P0335 is being output for the engine, troubleshoot the engine first.
1
Check for open and short in harness and connector between terminal NE of
throttle control ECU and terminal NEO of ECM (See page
NG
Repair or replace harness or connector.
OK
2
Check voltage between terminal NE of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal NE of throttle control ECU
and body ground for the engine conditions below.
OK:
Engine condition
Voltage
OFF (IG ON)
3 - 6 V or below 1 V
ON (Idling)
2 - 3 V (Pulse)
NG
Check and replace ECM.
OK
Check and replace throttle control ECU.
F03393
Trottle Conrol ECU
5V
5V
EFIF
EFI+
EFI-
GE11
P
B
W
(Shielded)
ECM
EFIF
EFI+
EFI-
T15
T15
17
7
20
15
T15
67
E9
27
E10
26
E10
T15
DI-532
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
760
Author:
Date:
1997 SUPRA (RM502U)
DTC
42
Engine Control System Malfunction
CIRCUIT DESCRIPTION
If trouble in the engine control system causes the malfunction indicator light to light up, this information is
transmitted from the ECM to the throttle control ECU. Then throttle control ECU may prohibit TRAC control
as a result.
DTC No.
DTC Detecting Condition
Trouble Area
42
ECM detected malfunction signal ON (output voltage at termi-
nal EFIF is 4.5 V or more, or 5.5 V or less for 1 sec. or more).
Wire harness and connector (EFIF circuit)
ECM
Throttle control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check the DTC for the engine (See page
*1
Repair engine control system according to the
code output.
*2
*1: Output NG code
*2: Malfunction indicator light remains ON
DI4W3-01
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-533
761
Author:
Date:
1997 SUPRA (RM502U)
2
Check for open and short in harness and connector between terminal EFIF of
throttle control ECU and terminal EFIF of ECM (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03393
Trottle Conrol ECU
5V
5V
EFIF
EFI+
EFI-
GE11
P
B
W
(Shielded)
ECM
EFIF
EFI+
EFI-
T15
T15
17
7
20
15
T15
67
E9
27
E10
26
E10
T15
DI-534
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
762
Author:
Date:
1997 SUPRA (RM502U)
DTC
43
ECM Communication Circuit Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
43
ECM normal communication data is not received for 5 sec. or
more.
Wire harness and connector (EFI+ and EFI- circuit)
ECM
Throttle control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check for open and short in harness and connector between terminals EFI+ and
EFI- of throttle control ECU and ECM (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace ECM or throttle control
ECU.
DI4W4-01
F03368
Throttle Control
ECU
R/B No.5
Throttle Control Relay
(TRAC Solenoid Relay)
R/B
No.2
Battery
+B
RLY-
RLY+
E01
9
12
4
13
BR
L-B
BR-B
L-R
14
11
12
L-B
L-Y
TRAC
L-R
BR-B
B
2
1 2A
2
1
5
4
3
5
1
6
5
5
T15
EC
IB5
T16
T16
T16
IB5
IB5
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-535
763
Author:
Date:
1997 SUPRA (RM502U)
DTC
51, 52
Power Source Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
51
In case power source voltage comes down, sub-throttle valve
angle difference occurs.
Wire harness and connector (+B and E01 circuit)
Throttle control ECU
52
Engine speed is 500 rpm or more and throttle relay is ON and
ECU terminal +B voltage is less than 8 V for 10 sec. or more.
Battery
IC regulator
Wire harness and connector (+B and E01 circuit)
Throttle control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check battery positive voltage.
OK:
Voltage: 10 - 14 V
NG
Check and repair the charging system.
OK
DI4W5-01
BE6653
F03395
F03396
ON
E01
DI-536
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
764
Author:
Date:
1997 SUPRA (RM502U)
2
Check for open and short in harness and connector between terminal +B of
throttle control ECU and throttle control relay (See page
).
NG
Repair or replace harness or connector.
OK
3
Check voltage between terminals +B and E01 of throttle control ECU connector.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals +B and E01 of throttle con-
trol ECU connector.
OK:
Voltage: 9 - 14 V
OK
Check and replace throttle control ECU.
NG
BE6653
F03397
F03398
LOCK
E01
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-537
765
Author:
Date:
1997 SUPRA (RM502U)
4
Check continuity between terminal E01 of throttle control ECU connector and
body ground.
CHECK:
Measure resistance between terminal E01 of throttle control
ECU connector and body ground.
OK:
Resistance: 1
Ω
or less
NG
Repair or replace harness or connector.
OK
Check for open in harness and connector between throttle control ECU and battery
(See page
).
BR3583
BR3582
F00010
Speed Sensor
High Speed
Rotor
+V
-V
Low Speed
To ECU
Magnet
Coil
N
S
DI-538
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
766
Author:
Date:
1997 SUPRA (RM502U)
DTC
61, 62, 63, 64
Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
both the ABS and TRAC control systems. The front and rear ro-
tors each have 48 serrations.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.
DTC Detecting Condition
Trouble Area
61,62,63,64
When the brake switch is OFF, one of the symmetrical wheels’
speed becomes one eight or less of the slowest speed of other
3 wheels continuously for 10 sec. or more.
Right front, left front, right rear and left rear speed sensor
Wire harness and connector (FRO, FLO, RRO and RLO
circuit)
Throttle control ECU
HINT:
DTC No.61 is for the right front speed sensor.
DTC No.62 is for the left front speed sensor.
DTC No.63 is for the right rear speed sensor.
DTC No.64 is for the left rear speed sensor.
DI4W6-01
BR5402
Throttle Control ECU
12V
FRO
FLO
RRO
RLO
LG-B
O
Y-B
GR-R
Speed
Sensor
FRO
FLO
RRO
RLO
ABS ECU
16
T16
8
15
7
7
20
A20
A20
A20
6
9
A20
T16
T16
T16
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-539
767
Author:
Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If the DTC is output from the ABS warning light, troubleshoot the ABS first.
1
Check for open and short in harness and connector between terminals FRO,
FLO, RRO, RLO of ABS ECU and throttle control ECU (See page
NG
Repair or replace harness or connector.
OK
R14205
2
1
R14213
1
2
DI-540
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
768
Author:
Date:
1997 SUPRA (RM502U)
2
Check speed sensor.
Front
PREPARATION:
(a)
Remove front fender splash shield.
(b)
Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 - 2.5 k
Ω
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 M
Ω
or higher
Rear
PREPARATION:
(a)
Remove rear seat cushion, seat back and quarter trim
panel.
(b)
Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.65 - 1.8 k
Ω
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 M
Ω
or higher
NG
Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page
OK
3
Check for open and short in harness and connector between each speed sensor
and ABS ECU (See page
).
NG
Repair or replace harness or connector.
OK
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-541
769
Author:
Date:
1997 SUPRA (RM502U)
4
Check for open and short in harness and connector between terminals FRO,
FLO, RRO, RLO of throttle control ECU and ABS ECU (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03376
ECM
VTO2
IDL2
Sub-throttle
Position Sensor
39
E10
E9
63
GR-R
G-O
T15
19
GR-R
GR-R
3
T15
26
T15
BR
12V
VTA2
12V
12V
GE01
E01
B
B
A
A
12V
12V
12
T15
T15
25
T15
T15
23
T15
13
T15
W-B
(Shielded)
L
Y
R
B
Sub-throttle
Valve Motor
6
4
3
1
2
ED
EC
IDL2
E1
11
24
Trottle Control ECU
DI-542
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
770
Author:
Date:
1997 SUPRA (RM502U)
DTC
71, 72
Emergency Fuel Cut
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
71
Vehicle stability control required signal is received 2 times
continuously from ECM and throttle control ECU is detected
the motor system malfunction. The 2nd vehicle stability re-
quired signal is received more or less than 0.5 sec.
Sub-throttle valve motor
Sub-throttle valve
Th ttl
t l ECU
72
Vehicle stability control required signal is received 2 times
continuously from ECM.
Throttle control ECU
WIRING DIAGRAM
DI4W7-01
F03377
3
6
4
1
F03378
BE6653
F03379
F03380
ON
IDL2
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-543
771
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check sub-throttle valve motor.
PREPARATION:
Disconnect sub-throttle valve motor connector.
CHECK:
Check continuity between each terminal of sub-throttle valve
motor connector.
OK:
Terminals 1 and 3
Continuity
Terminal 4 and 6
Continuity
(Reference value 0.40 - 0.48
Ω
)
NG
Replace sub-throttle valve motor.
OK
2
Check voltage between terminal IDL2 of throttle control ECU and body ground.
PREPARATION:
(a)
Remove throttle control ECU with connectors still con-
nected.
(b)
Remove intake air duct.
(c)
Disconnect sub-throttle valve motor connector.
(d)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve position
Voltage
Fully closed
0 - 3 V
Fully open
9 - 14 V
OK
Go to step 4.
NG
DI-544
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
772
Author:
Date:
1997 SUPRA (RM502U)
3
Check for open and short in harness and connector between terminal IDL2 of
throttle control ECU and sub-throttle osition sensor (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
4
Check sub-throttle position sensor (See page
NG
Adjust or replace sub-throttle position sensor
(See page SF-44).
OK
5
Check for open and short in harness and connector between terminal E01, E1 of
throttle control ECU and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03400
J/B No.1
GAUGE
12
Throttle Control
ECU
WA
ABS
Warning Light
Y
L
L
L
L
ABS ECU
12V
WA
5
11
A20
IF2
T5
T16
1E
4
2
T5
12
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-545
773
Author:
Date:
1997 SUPRA (RM502U)
DTC
81
ABS Control System Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
81
Engine speed is 500 rpm or more and ABS warning light is ON
for 12 sec. or more.
Wire harness and connector (WA circuit)
ABS ECU
Throttle control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check the DTC for the ABS (See page
*1
Repair ABS control system according to the
code output.
*2
*1: Output NG code
*2: Malfunction indicator light remains ON
DI4W8-01
BE6653
F03401
F03402
ON
WA
DI-546
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
774
Author:
Date:
1997 SUPRA (RM502U)
2
Check voltage between terminal WA of throttle control ECU and body ground
(See page
).
PREPARATION:
Remove throttle control ECU with connectors still connected.
CHECK:
Measure voltage between terminal WA of throttle control ECU
and body ground.
OK:
Voltage: 9 - 14 V
NG
Check and replace ABS ECU.
OK
3
Check for short in harness and connector between terminal WA of ABS ECU and
throttle control ECU (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03403
Throttle Control ECU
WT
12V
CSW
T16
T16
6
10
LG-R
LG-R
IF2
2
TRAC OFF Switch
(TRAC Control Switch)
LG
4
6
W-B
IG
IE
W-B
W-B
LG-R
13
OPA
DLC2
J/B No.1
GAUGE
1E
12
Y
T5
2
TRAC OFF
Indicator
T5
8
LG-R
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-547
775
Author:
Date:
1997 SUPRA (RM502U)
TRAC OFF Indicator Light, TRAC OFF Switch Circuit
CIRCUIT DESCRIPTION
This is the TRAC control main switch. When the TRAC OFF switch is pushed on, TRAC control goes off and
the TRAC OFF indicator lights up. This indicator blinks for warnings when the trouble occurs and for display-
ing DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check DTC.
Check DTC on page
YES
Repair circuit indicated by the code output.
NO
DI4W9-01
F03404
TRAC OFF Switch
(TRAC Control Switch)
4
6
DI-548
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
776
Author:
Date:
1997 SUPRA (RM502U)
2
Check TRAC OFF switch.
PREPARATION:
(a)
Remove TRAC OFF switch (TRAC control switch).
(b)
Disconnect TRAC control switch connector.
CHECK:
Measure resistance between terminals 4 and 6 of TRAC control
switch when TRAC OFF switch is on and off.
OK:
TRAC OFF switch
Resistance
Pushed in
Continuity
Released
1 M
Ω
or higher
NG
Replace TRAC control switch.
OK
3
Check for open and short in harness and connector between terminal CSW of
throttle control ECU and TRAC control switch and body ground
(See page
).
NG
Repair or replace harness or connector.
OK
4
Check TRAC OFF indicator light.
See combination meter troubleshooting on page
NG
Repair or replace combination meter.
OK
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-549
777
Author:
Date:
1997 SUPRA (RM502U)
5
Check for open and short in harness and connector between terminal WT of
throttle control ECU and TRAC OFF indicator light (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03405
Throttle Control ECU
IND
T16
2
W
IF2
1
W
C12
7
SLIP
Indicator
Light
C10
Y
1E
12
J/B No.1
GAUGE
9
DI-550
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
778
Author:
Date:
1997 SUPRA (RM502U)
SLIP Indicator Light Circuit
CIRCUIT DESCRIPTION
The SLIP indicator blinks during TRAC operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check SLIP indicator light.
See combination meter troubleshooting on page
NG
Repair or replace combination meter.
OK
2
Check for short in harness and connector between throttle control ECU and SLIP
indicator light (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
DI4WA-01
F03406
F03406
Throttle Control ECU
SNOW
Indicator
Light
J/B No.1
SNOW Mode Switch
(TRAC Control Switch)
SIND
SNOW
GAUGE
P-G
P-G
R-B
W-B
W-B
W-B
Y
T16
11
T16
14
IF1
9
C12
5
C10
9
1E
12
IE
IG
8
6
F03407
6
8
SNOW Mode Switch
(TRAC Control Switch)
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-551
779
Author:
Date:
1997 SUPRA (RM502U)
SNOW Indicator Light, SNOW Mode Switch Circuit
CIRCUIT DESCRIPTION
When you push the SNOW mode switch, TRAC control becomes SNOW mode operation and the SNOW
indicator light on, and when you push the TRAC OFF switch, TRAC control will be released to normal mode
operation and the SNOW indicator light goes off.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check SNOW mode switch.
PREPARATION:
(a)
Remove SNOW mode switch (TRAC control switch).
(b)
Disconnect TRAC control switch connector.
CHECK:
Measure resistance between terminals 6 and 8 of TRAC control
switch when SNOW mode switch on and off.
OK:
TRAC control switch
Resistance
SNOW mode switch pushed in
Continuity
TRAC OFF switch pushed in
1 M
Ω
or higher
NG
Replace TRAC control switch.
OK
DI4WB-01
DI-552
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
780
Author:
Date:
1997 SUPRA (RM502U)
2
Check for open and short in harness and connector between SNSW of throttle
control ECU and TRAC control switch and body ground (See page
NG
Repair or replace harness or connector.
OK
3
Check SNOW indicator light.
See combination meter troubleshooting on page
NG
Repair or replace combination meter.
OK
4
Check for short in harness and connector between throttle control ECU and
SNOW indicator light (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
F03408
Throttle Control ECU
12V
Tc
R
R
R
P-B
DLC1
Tc
E1
BR
BR
BR
BR
DLC2
E1
Tc
3
11
21
11
3
18
ED
3
4
IJ1
II1
IF1
T16
P-B
S−17−1 F02201
F03525
DLC2
DLC1
E
1
Tc
E
1
Tc
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI-553
781
Author:
Date:
1997 SUPRA (RM502U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of DLC1 or DLC2, the ECU displays the DTC by blinking the TRAC OFF
indicator light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminals Tc and E1 of DLC2 or DLC1.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC2 or
DLC1.
OK:
Voltage: 10 - 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms chart (See page
).
NG
DI4WC-01
DI-554
-
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
782
Author:
Date:
1997 SUPRA (RM502U)
2
Check for open and short in harness and connector between throttle control
ECU and DLC2 or DLC1, DLC2 or DLC1 and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
DI4WD-01
Vehicle Brought to Workshop
Customer Problem Analysis
Warning Light Check
DTC Check
DTC Chart
Circuit Inspection
Remains on
Normal and Malfunction Code
Symptom Simulation
DTC Check
Identification of Problem
Warning Light Check
Confirmation Test
Warning Light ON
Warning Light Remains Off
END
Normal
Normal
1
2
3
4
7
Repair
8
5
6
Step
,
:
Diagnostic steps permitting the use
of the TOYOTA hand-held tester.
3
6
Remains ON
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-555
783
Author:
Date:
1997 SUPRA (RM502U)
SUPPLEMENTAL RESTRAINT SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following pages.
DI4WE-01
Supplemental Restraint System Check Sheet
Date Problem Occurred
Customer’s Name
Registration No.
Registration
Year
Frame No.
Odometer Reading
Weather
Temperature
Vehicle Operation
Road Conditions
Details Of Problem
Vehicle Inspection, Repair Histo-
ry Prior to Occurrence of Mal-
function(Including Supplemental
Restraint System)
Diagnosis System Inspection
SRS Warning Light
Inspection
DTC Inspection
1st Time
2nd Time
1st Time
2nd Time
Inspector’s
Name
Fine
Cloudy
Rainy
Snowy
Other
Approx.
Starting
Idling
Driving
[
Constant speed
Acceleration
Deceleration
Other
]
Remains ON
Sometimes Light Up
Does Not Light Up
Remains ON
Sometimes Light Up
Does Not Light Up
Normal Code
Malfunction Code
Normal Code
Malfunction Code
[ Code.
]
[ Code.
]
km
Miles
/
/
/
/
/
/
Date Vehicle Brought In
DI-556
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
784
Author:
Date:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK
DI4WF-01
R06853
H03184
E
1
Tc
Tc
E
1
DLC 1
DLC 2
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-557
785
Author:
Date:
1997 SUPRA (RM502U)
PRE-CHECK
1.
CHECK SRS WARING LIGHT
(a)
Turn the ignition switch to ACC or ON and check that the
SRS warning light lights up.
(b)
Check that the SRS warning light goes out after approx.
6 seconds.
HINT:
When the ignition switch is at ACC or ON and the SRS
warning light remains on or flashes, the airbag sensor as-
sembly has detected a malfunction code.
If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes lights up or the SRS warning light
lights up even when the ignition switch is OFF, a short in
the SRS warning light circuit can be considered likely.
Proceed to ”SRS warning light system malfunction” on
page
.
2.
CHECK DTC (Using diagnosis check wire)
(a)
Using diagnosis check wire, check the output of DTC.
(1)
Turn the ignition switch to ACC or ON position and
wait approx. 20 seconds.
(2)
Using SST, connect the terminals Tc and E
1
of the
DLC1.
HINT:
DTC check and troubleshooting of each DTC can also be done
using DLC2.
SST
09843-18020
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
AT0716
Normal Code
ON
OFF
0.25
0.25
AB0056
code 11 and 31
ON
OFF
0.5
2.5
4.0
1.5
0.5
Code 11
Code 31
Repeat
H03217
DI-558
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
786
Author:
Date:
1997 SUPRA (RM502U)
(b)
Read the DTC.
Read the 2-digit DTC as indicated by the number of times
the SRS warning light blinks. As an example, the blinking
patterns, normal, 11 and 31 are as shown on the illustra-
tion.
Normal code indication
The light will blink 2 times per second.
Malfunction code indication
The first blinking output indicates the first digit of a
2-digit DTC. After a 1.5 second pause, the second
blinking output will indicate the second digit.
If there are 2 or more codes, there will be a 2.5 second pause
between each code. After all the codes have been output, there
will be a 4.0 second pause and they will all be repeated.
HINT:
In the event of a number of trouble codes, indication will
start from the smallest numbered code.
If it does not output a DTC or outputs a DTC without termi-
nal connection, proceed to the Tc terminal circuit inspec-
tion on page
3.
CHECK DTC (Using TOYOTA hand-held tester)
(a)
Hook up the TOYOTA hand-held tester to the check con-
nector.
(b)
Read the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the TOYOTA hand-held tester operator’s manu-
al, for further details.
4.
CLEAR DTC (Using diagnosis check wire)
When the ignition switch is turned off, the DTC is cleared.
AB0130 AB0045 AB0046
W03146 W03147
W01805
H09720
Connector (1)
Airbag Sensor
Assembly
Front Passenger
Airbag Assembly
No.1 J/B
Spiral Cable
Steering Wheel
Pad (Squib)
Connector (2)
Connector (3)
Connector (5)
Connector (4)
Aibag Sensor Assembly Connector [Connector (1)]
Short Spring
Before Release
After Release
Spiral Cable Connector [Connector (5)]
Short Spring
Before Release
Paper
After Release
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-559
787
Author:
Date:
1997 SUPRA (RM502U)
5.
RELEASE METHOD OF AIRBAG ACTIVATION PREVENTION MECHANISM
An airbag activation prevention mechanism is built into the connecter for the squib circuit of the SRS.
When release of the airbag activation prevention mechanism is directed in the troubleshooting procedure,
as shown in the illustration of the connectors (1) and 839 below, insert paper which is the same thickness
as the male terminal, between the terminal and the short spring.
CAUTION:
NEVER RELEASE the airbag activation prevention mechanism on the steering wheel pad con-
nector.
NOTICE:
Do not release the airbag activation prevention mechanism unless specifically directed by the
troubleshooting procedure.
If the paper inserted is too thick the terminal and short spring may be damaged, so always use
paper the same thickness as the male terminal.
DI4WG-01
DI-560
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
788
Author:
Date:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
DTC No.
(See Page)
Detection Item
Trouble Area
SRS
Warning Light
(N
l)
System normal
-
OFF
(Normal)
(
Source voltage drop
Battery
Airbag sensor assembly
ON
11
(
Short in squib circuit (to ground)
Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
12
(
Short in squib circuit (to B+)
Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
13
(
Short in D squib circuit
Steering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
14
(
Open in D squib circuit
Steering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
31
(
Airbag sensor assembly malfunction
Airbag sensor assembly
ON
53
(
Short in P squib circuit
Front passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
ON
54
(
Open in P squib circuit
Front passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
ON
HINT:
When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drop.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, after approx. 10 seconds the SRS warning light will automatically go out.
When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.
If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.
DI4WH-01
W02646
SRS Waring Light
(Telltale Light RH)
Front Passenger
Airbag Assembly
Steering Wheel Pad
(with Airbag)
Spiral Cable
Airbag Sensor Assembly
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-561
789
Author:
Date:
1997 SUPRA (RM502U)
PARTS LOCATION
DI4WI-01
W02759
6
5
4 3
10
9
2
1
7
8
B
A
DI-562
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
790
Author:
Date:
1997 SUPRA (RM502U)
TERMINALS OF ECM
No.
Symbol
Terminal Name
A
-
Electrical Connection Check Mechanism
B
-
Electrical Connection Check Mechanism
1
P
-
Squib
(Passenger)
2
P
+
Squib
(Passenger)
3
LA
SRS Warning Light
4
D
-
Squib
(Driver)
5
D
+
Squib
(Driver)
6
Tc
Diagnosis
7
E
2
Ground
8
E
1
Ground
9
IG
2
Power Source (IGN Fuse)
10
ACC
Power Source (CIG Fuse)
DI4WJ-01
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-563
791
Author:
Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
Problem Symptom
Inspection Item
Page
WIth the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light lights up even when ignition switch is in the
LOCK position.
SRS warning light system malfunction (Always lit up when
ignition switch is in LOCK position.)
WIth the ignition switch at ACC or ON, the SRS warning light
does not light up.
SRS warning light system malfunction (Does not light up
when ignition switch is turned to ACC or ON.)
DTC not displayed.
SRS warning light is always lit up with a DTC check procedure.
DTC displayed without Tc and E
1
terminal connection.
Tc terminal circuit
DI4WK-01
W01021
P squib
D squib
A34
A34
A34
A34
L
Y
R
W
Airbag Sensor
Assembly
P
+
3
2
7
6
1
2
1
2
D
+
D
-
P
-
Spiral
Cable
DI-564
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
792
Author:
Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC
11
Short in Squib Circuit (to Ground)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
DTC 11 is recorded a when ground short is detected in the squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
11
Short circuit in squib wire harness (to ground).
Squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.
Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
R05894
R14301
H07909
P squib
Airbag Sensor
Assembly
D squib
D
+
Spiral
Cable
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-565
793
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1
Preparation (See step 1 on page
2
Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+
and body ground.
OK:
Resistance: 1 M
Ω
or higher
NG
OK
R05898
R14301
H07910
P squib
Airbag Sensor
Assembly
D squib
P
+
Spiral
Cable
DI-566
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
794
Author:
Date:
1997 SUPRA (RM502U)
3
Check P squib circuit.
PREPARATION:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and front passenger airbag
assembly, measure the resistance between P
+
and body
ground.
OK:
Resistance: 1 M
Ω
or higher
NG
Repair or replace harness or connector be-
tween the airbag sensor assembly and front
passenger airbag assembly.
OK
AB0069
R05902
AB0118 AB0119
AB0057
AB0069
N19819
H07911
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
or
E
1
Tc
DLC1
Code 11
P
+
P
-
D
+
D
-
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-567
795
Author:
Date:
1997 SUPRA (RM502U)
4
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to airbag sensor assembly.
(b)
Using a service wire, connect D
+
and D
-
on spiral cable
side of connector between spiral cable and steering
wheel pad.
(c)
Using a service wire, connect P
+
and P
-
on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 11 is not output.
HINT:
Codes other than code 11 may be output at this time, but they
are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H03221
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
E
1
Tc
DLC1
Code 11
or
DI-568
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
796
Author:
Date:
1997 SUPRA (RM502U)
5
Check D squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the steering wheel pad connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 11 is not output.
HINT:
Codes other than code 11 may be output at this time, but they
are not relevant to this check.
NG
Replace steering wheel pad.
OK
H03222
P squib
Spiral
Cable
ACC
ON
E
1
Tc
DLC1
Code 11
or
Airbag Sensor
Assembly
D squib
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-569
797
Author:
Date:
1997 SUPRA (RM502U)
6
Check P squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the front passenger airbag assembly connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 11 is not output.
HINT:
Codes other than code 11 may be output at this time, but they
are not relevant to this check.
NG
Replace front passenger airbag assembly.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.
R05899
R14301
H07912
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
D
+
DI-570
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
798
Author:
Date:
1997 SUPRA (RM502U)
7
Check spiral cable.
PREPARATION:
Disconnect the connector between airbag sensor assembly
and spiral cable.
CHECK:
Measure the resistance between D
+
on spiral cable side of con-
nector between spiral cable and steering wheel pad and body
ground.
OK:
Resistance: 1 M
Ω
or higher
NG
Repair or replace spiral cable.
OK
Repair or replace harness or connector be-
tween airbag sensor assembly and spiral
cable.
AB0119
R05901
R14288
H07913
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ON
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-571
799
Author:
Date:
1997 SUPRA (RM502U)
DTC
12
Short in Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
DTC 12 is recorded when a B+ short is detected in the squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
12
Short circuit in squib wire harness (to B+).
Squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.
Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Refer to page
INSPECTION PROCEDURES
1
Preparation (See step 1 on page
2
Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the voltage between D
+
and body ground.
OK:
Voltage: 0 V
NG
OK
DI4WL-01
AB0119
R05898
R14288
H07914
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ON
P
+
(+)
(-)
DI-572
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
800
Author:
Date:
1997 SUPRA (RM502U)
3
Check P squib circuit.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween airbag sensor assembly and front passenger airbag as-
sembly, measure the voltage between P
+
and body ground.
OK:
Voltage: 0 V
NG
Repair or replace harness or connector be-
tween the airbag sensor assembly and front
passenger airbag assembly.
OK
AB0069
R05902
AB0069
AB0118 AB0119
FI1389
N19819
H07915
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
or
E
1
Tc
DLC1
Code 12
P
+
P
-
D
+
D
-
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-573
801
Author:
Date:
1997 SUPRA (RM502U)
4
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to airbag sensor assembly.
(b)
Using a service wire, connect D
+
and D
-
on spiral cable
side of connector between spiral cable and steering
wheel pad.
(c)
Using a service wire, connect P
+
and P
-
on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
+
NG
Replace airbag sensor assembly.
OK
H03224
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ON
ACC
DLC 1
Code 12
Tc
E
1
or
DI-574
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
802
Author:
Date:
1997 SUPRA (RM502U)
5
Check D squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the steering wheel pad connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG
Replace steering wheel pad.
OK
H03225
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ON
ACC
DLC 1
Code 12
Tc
E
1
or
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-575
803
Author:
Date:
1997 SUPRA (RM502U)
6
Check P squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the front passenger airbag assembly connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG
Replace front passenger airbag assembly.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
AB0119
R05899
R14288
H07916
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ON
DI-576
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
804
Author:
Date:
1997 SUPRA (RM502U)
7
Check spiral cable.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect the connector between airbag sensor assem-
bly and spiral cable.
(c)
Turn the ignition switch ON.
CHECK:
Measure voltage at D
+
on spiral cable side of connector be-
tween spiral cable and steering wheel pad and body ground.
OK:
Voltage: 0 V
NG
Repair or replace spiral cable.
OK
Repair or replace harness or connector between airbag sensor assembly and spiral cable.
R16015
D squib
Spiral
Cable
1
2
R
W
7
6
Airbag Sensor
Assembly
A34
A34
D
-
D
+
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-577
805
Author:
Date:
1997 SUPRA (RM502U)
DTC
13
Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
DTC 13 is recorded when a short is detected in the D squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
13
Short circuit between D
+
wire harness and D
-
wire harness
of squib.
D squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.
Steering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
DI4WM-01
R05901
R14286
H07917
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
D
-
D
+
(-)
(+)
DI-578
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
806
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1
Preparation (See step 1 on page
2
Check D squib circuit.
PREPARATION:
Release airbag activation prevention mechanism on airbag
sensor assembly side of airbag squib connector.
(See page
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+
and D
-
.
OK:
Resistance: 1M
Ω
or Higher
NG
OK
H03227
P squib
Spiral
Cable
D squib
Airbag Sensor
Assembly
ACC
ON
or
DLC1
Code 13
E
1
Tc
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-579
807
Author:
Date:
1997 SUPRA (RM502U)
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to airbag sensor assembly.
(b)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 13 is not output.
HINT:
Codes other than code 13 may be output at this time, but they
are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H03228
P squib
Spiral
Cable
D squib
Airbag Sensor
Assembly
ACC
ON
or
DLC1
Code 13
E
1
Tc
DI-580
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
808
Author:
Date:
1997 SUPRA (RM502U)
4
Check D squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the steering wheel pad connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(b)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(c)
Clear malfunction code stored in memory.
(See page
(d)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(e)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(f)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(g)
Check DTC.
OK:
DTC 13 is not output.
HINT:
Codes other than code 13 may be output at this time, but they
are not relevant to this check.
NG
Replace steering wheel pad.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
R05903
R14286
H07918
P squib
Spiral
Cable
D squib
Airbag Sensor
Assembly
D
-
D
+
(-)
(+)
R05904
R14286
H03814
P squib
Spiral
Cable
D squib
Airbag Sensor
Assembly
(-)
(+)
D
-
D
+
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-581
809
Author:
Date:
1997 SUPRA (RM502U)
5
Check spiral cable.
PREPARATION:
(a)
Disconnect the connector between airbag sensor assem-
bly and spiral cable.
(b)
Release airbag activation prevention mechanism on air-
bag sensor assembly side of airbag squib connector (See
page
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+
and D
-
.
OK:
Resistance: 1M
Ω
or Higher
NG
Repair or replace spiral cable.
OK
6
Check harness between airbag sensor assembly and spiral cable.
PREPARATION:
Release airbag activation prevention mechanism on airbag
sensor assembly side of airbag squib connector (See page
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the spiral cable and airbag sensor assembly, measure
the resistance between D
+
and D
-
.
OK:
Resistance: 1 M
Ω
or higher
NG
Repair or replace harness or connector be-
tween airbag sensor assembly and spiral cable.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
R05901
R14286
H07919
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
D
-
D
+
(-)
(+)
DI-582
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
810
Author:
Date:
1997 SUPRA (RM502U)
DTC
14
Open in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
DTC 14 is recorded when an open is detected in the D squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
14
Open circuit in D
+
wire harness or D
-
wire harness of squib.
D squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.
Steering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Refer to page
INSPECTION PROCEDURES
1
Preparation (See step 1 on page
2
Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+
and D
-
.
OK:
Resistance: Below 1
Ω
NG
OK
DI4WN-01
R05895 AB0069
AB0118 AB0119
FI1391
N19819
H07920
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
or
E
1
Tc
DLC1
Code 14
D
+
D
-
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-583
811
Author:
Date:
1997 SUPRA (RM502U)
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to airbag sensor assembly.
(b)
Using a service wire, connect D
+
and D
-
on spiral cable
side of connector between spiral cable and steering
wheel pad.
(c)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 14 is not output.
HINT:
Codes other than code 14 may be output at this time, but they
are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H03231
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ACC
ON
or
E
1
DLC1
Code 14
Tc
DI-584
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
812
Author:
Date:
1997 SUPRA (RM502U)
4
Check D squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the steering wheel pad connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 14 is not output.
HINT:
Codes other than code 14 may be output at this time, but they
are not relevant to this check.
NG
Replace steering wheel pad.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
R05899
R14286
H07921
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
D
-
D
+
(-)
(+)
R05904
R14286
H03814
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
D
+
(-)
(+)
D
-
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-585
813
Author:
Date:
1997 SUPRA (RM502U)
5
Check spiral cable.
PREPARATION:
Disconnect the connector between airbag sensor assembly
and spiral cable.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+
and D
-
.
OK:
Resistance: Below 1
Ω
NG
Repair or replace spiral cable.
OK
6
Check harness between airbag sensor assembly and spiral cable.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and spiral cable, measure
the resistance between D
+
and D
-
.
OK:
Resistance: Below 1
Ω
NG
Repair or replace harness or connector be-
tween airbag sensor assembly and spiral cable.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
AB0119
W02766
H00041
ON
Airbag Sensor Assembly
ACC
IG2
(-)
(+)
DI-586
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
814
Author:
Date:
1997 SUPRA (RM502U)
DTC
31
Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensors, judges whether or not the SRS must be activated, and diagnosis
system malfunction.
DTC 31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.
DTC No.
DTC Detecting Condition
Trouble Area
31
Airbag sensor assembly malfunction.
Airbag sensor assembly
INSPECTION PROCEDURES
HINT:
When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction indi-
cated by the malfunction code other than code 31.
1
Preparation (See step 1 on page
2
Check voltage at IG2 and ACC of airbag sensor assembly.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals IG2 and ACC of airbag
sensor assembly and body ground.
OK:
Voltage: Below 16 V
NG
Check battery and charging system.
(See charging system section)
OK
DI4WO-01
H03232
ACC
ON
or
DLC1
Code 31
E
1
Tc
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-587
815
Author:
Date:
1997 SUPRA (RM502U)
3
Is DTC 31 output again?
PREPARATION:
Clear malfunction code.
CHECK:
(a)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(b)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(c)
Repeat operation in step (1) and (2) at least 5 times.
(d)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(e)
Check DTC.
NO
Using simulation method, reproduce malfunc-
tion symptoms (See page
).
YES
Replace airbag sensor assembly.
R16016
P squib
Airbag Sensor
Assembly
1
2
L
Y
2
3
P
+
P
-
A34
A34
DI-588
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
816
Author:
Date:
1997 SUPRA (RM502U)
DTC
53
Short in P Squib Circuit
CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
DTC 53 is recorded when a short is detected in the P squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
53
Short circuit between P
+
wire harness or P
-
wire harness of
squib.
P squib malfunction.
Airbag sensor assembly malfunction.
Front passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
DI4WP-01
R05898
R14287
H07922
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-589
817
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1
Preparation (See step 1 on page
2
Check P squib circuit.
PREPARATION:
Release airbag activation prevention mechanism on airbag
sensor assembly side of airbag squib connector
(See page
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and front passenger airbag
assembly, measure the resistance between P
+
and P
-
.
OK:
Resistance: 1 M
Ω
or Higher
NG
Repair or replace harness or connector be-
tween airbag sensor assembly and front pas-
senger airbag assembly.
OK
H03233
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ACC
ON
DLC1
Code 53
E
1
Tc
or
DI-590
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
818
Author:
Date:
1997 SUPRA (RM502U)
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to airbag sensor assembly.
(b)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 53 is not output.
HINT:
Codes other than code 53 may be output at this time, but they
are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H03234
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ACC
ON
DLC1
Code 53
or
E
1
Tc
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-591
819
Author:
Date:
1997 SUPRA (RM502U)
4
Check P squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the front passenger airbag assembly connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(b)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(c)
Clear malfunction code stored in memory.
(See page
(d)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(e)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(f)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(g)
Check DTC.
OK:
DTC 53 is not output.
HINT:
Codes other than code 53 may be output at this time, but they
are not relevant to this check.
NG
Replace front passenger airbag assembly.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
R14287
R05898
H07923
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
P
-
(+)
(-)
P
+
DI-592
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
820
Author:
Date:
1997 SUPRA (RM502U)
1
DTC
54
Open in P Squib Circuit
CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page
DTC 54 is recorded when an open is detected in the P squib circuit.
DTC No.
DTC Detecting Condition
Trouble Area
54
Open circuit in P
+
wire harness or P
-
wire harness of squib.
P squib malfunction.
Airbag sensor assembly malfunction.
Front passenger airbag assembly (P squib)
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Refer to page
INSPECTION PROCEDURES
1
Preparation (See step 1 on page
2
Check P squib circuit.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and front passenger airbag
assembly measure the resistance between P
+
and P
-
.
OK:
Resistance: Below 1
Ω
NG
Repair or replace harness or connector be-
tween airbag sensor assembly and front pas-
senger airbag assembly.
OK
DI4WQ-01
AB0069 R05895
AB0118 AB0119
R05170
N19819
H07974
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
or
Code 54
DLC1
E
1
Tc
P
+
P
-
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-593
821
Author:
Date:
1997 SUPRA (RM502U)
3
Check airbag sensor assembly.
PREPARATION:
(a)
Connect the connector to airbag sensor assembly.
(b)
Using a service wire, connect P
+
and P
-
on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(c)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON and wait at least 20
seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC1.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 54 is not output.
HINT:
Codes other than code 54 may be output at this time, but they
are not relevant to this check.
NG
Replace airbag sensor assembly.
OK
H03236
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
ACC
ON
or
DLC1
Code 54
E
1
Tc
DI-594
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
822
Author:
Date:
1997 SUPRA (RM502U)
4
Check P squib.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Connect the front passenger airbag assembly connector.
(d)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(b)
Clear malfunction code stored in memory.
(See page
(c)
Turn the ignition switch to LOCK, and wait at least 20 se-
conds.
(d)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(e)
Using SST, connect the terminals Tc and E
1
of DLC
1
.
SST
09843-18020
(f)
Check DTC.
OK:
DTC 54 is not output.
HINT:
Codes other than code 54 may be output at this time, but they
are not relevant to this check.
NG
Replace front passenger airbag assembly.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
W00786
Relay Block No.2
Junction Block No.1
Airbag Sensor
Assembly
2
2
1B
1J
1J
1J
1G
1G
6
10
3
8
3
G
4
4
W
AL
T
AM2
Battery
IB1
4
Ignition Switch
Junction Block No.1
ACC
16
15
AM1
6 B-W
7
2
W-R
G-R
B-O
IG2
W
2
2
2A
Relay Block No.2
W
B
1
W-R
CIG
IGN
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-595
823
Author:
Date:
1997 SUPRA (RM502U)
DTC
Normal
Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter)functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.
DTC Detecting Condition
Trouble Area
Normal
Source voltage drop.
Battery
Airbag sensor assembly
WIRING DIAGRAM
DI4WR-01
R05894
AB0117
H00001
P squib
Airbag Sensor
Assembly
D squib
Spiral
Cable
LOCK
AB0119
W02766
H00041
Airbag Sensor Assembly
ON
ACC
IG2
(-)
(+)
DI-596
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
824
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1
Preparation.
PREPARATION:
(a)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(b)
Remove the steering wheel pad (See SR Section).
(c)
Disconnect the connector of front passenger airbag as-
sembly (See page
(d)
DIsconnect the connector of airbag sensor assembly
(See page
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2
Check source voltage.
PREPARATION:
(a)
Connect negative (-) terminal cable to the battery.
(b)
Turn the ignition switch ON.
CHECK:
Measure the voltage at IG2 or ACC on sensor and operate elec-
tric system. (defogger, wiper, headlight, heater blower, etc)
OK:
Voltage: 10 - 14 V
NG
Check the harness between battery and airbag
sensor assembly, and check the battery and
charging system.
OK
AB0119
AB0234
H07975
ON
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-597
825
Author:
Date:
1997 SUPRA (RM502U)
3
Does SRS warning light turn off ?
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Connect the steering wheel pad connector.
(c)
Connect the front passenger airbag assembly connector.
(d)
Connect the airbag sensor assembly connector.
(e)
Turn the ignition switch ON.
CHECK:
Operate electric system checked in (defogger, wiper, headlight,
heater blower, etc.) and check that SRS warning light goes off.
NO
Check for DTCs. If a DTC is output, trouble-
shooting for the DTC. If a normal code is output,
replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
W03534
2
1E
1G
1E
1G
II1
IF1
IF1
II1
1E
1B
3
7
9
4
2
13
12
11
21
2
Battery
1
B
5
11
DLC1
Relay Block No.2
AL
T
Power
Power
Airbag Sensor
Assembly
Junction Block No.1
Junction Block No.1
SRS Waring Light
2
15
Junction Block No.1
*1: 2JZ-GE Engine
*2: 2JZ-GTE Engine
ECU-B
Tc
AB
B (*1)
(*2)
B-Y
LA
12
W-R
P-B
R (*1)
(*2)
P-B
P-B
2
2A
2
P-B 7
Tc
W-L
AB
Tc
DLC2
R
4
12
B-Y
B
B
B
B
DI-598
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
826
Author:
Date:
1997 SUPRA (RM502U)
SRS Warning Light System Malfunction (Always lit up, when igni-
tion switch is in LOCK position.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E
1
of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
DI4WS-01
AB0117
R05902
H07976
LOCK
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
AB0117
W02765
H00044
LOCK
Airbag Sensor Assembly
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-599
827
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
1
Preparation.
PREPARATION:
(a)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(b)
Remove the steering wheel pad (See SR Section).
(c)
Disconnect the connector of front passenger airbag as-
sembly (See page
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2
Does SRS warning light turn off?
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Disconnect the airbag sensor assembly connector.
(d)
Connect negative (-) terminal cable to battery.
CHECK:
Check operation of SRS warning light.
NG
Check SRS warning light circuit or terminal AB
circuit of DLC1.
OK
Replace airbag sensor assembly.
N14677
Fuse
(+)
(-)
DI-600
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
828
Author:
Date:
1997 SUPRA (RM502U)
SRS Warning Light System Malfunction (Does not light up, when
ignition switch is in turned to ACC or ON.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E
1
of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
Refer to page
INSPECTION PROCEDURES
1
Check ECU-B Fuse.
PREPARATION:
Remove the ECU-B fuse.
CHECK:
Check the continuity of ECU-B fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG
OK
2
Preparation (See step 1 on page
DI4WT-01
W02760
AB0119
H00048
ON
Airbag Sensor Assembly
LA
(-)
(+)
H03185
P squib
Spiral
Cable
Airbag Sensor
Assembly
D squib
ON
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-601
829
Author:
Date:
1997 SUPRA (RM502U)
3
Check SRS warning light circuit.
PREPARATION:
(a)
Connect negative (-) terminal cable to battery.
(b)
Turn the ignition switch to ACC or ON.
CHECK:
Measure the voltage LA terminal of harness side connector of
airbag sensor assembly.
OK:
Voltage: 10 - 14 V
NG
Check SRS warning light balb/repair SRS warn-
ing light circuit.
OK
4
Does SRS warning light come on?
PREPARATION:
(a)
Disconnect negative (-) terminal cable from the battery.
(b)
Connect the airbag sensor assembly connector.
(c)
Connect negative (-) terminal cable to battery, and wait
at least 2 seconds.
(d)
Turn the ignition switch to ACC or ON.
CHECK:
Check operation of SRS warning light.
NO
Check terminal LA of airbag sensor assembly.
If normal, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
DI-602
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
830
Author:
Date:
1997 SUPRA (RM502U)
5
Is new ECU-B fuse burnt out again?
NO
Using simulation method, reproduce malfunc-
tion symptoms (See page
).
YES
Check harness between ECU- B fuse and
SRS warning light.
H03189
Airbag Sensor
Assembly
Tc
7
21
II1
11
3
Tc
E1
DLC1
BR
P-B
7
1E
1G
Junction Block No.1
P-B
R (*1)
P-B (*2)
3
11
IF1
R
Tc
E1
DTC2
BR
18
IJ1
BR
BR
ED
*1: 2JZ-GE
*2: 2JZ-GTE
R-B
4
3
P-B
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-603
831
Author:
Date:
1997 SUPRA (RM502U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E
1
of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI4WU-02
H03186
ACC
ON
or
LOCK
AB0118
R14305
AB0119
H00030
ACC
ON
or
(-)
DLC 1
(+)
Tc
E
1
DI-604
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
832
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURES
HINT:
If the DTC is not displayed, perform the following troubleshooting.
1
Does SRS warning light light up for approx. 6 seconds?
CHECK:
Check operation of SRS warning light after ignition switch is
turned from LOCK position to ACC or ON position.
NO
Check SRS warning lights system
(See page
).
YES
2
Check voltage between terminals Tc and E
1
of DLC1.
PREPARATION:
Turn the ignition switch to ACC or ON.
CHECK:
Measure the voltage between terminals Tc and E
1
of DLC1.
OK:
Voltage: 10 - 14 V
OK
NG
AB0118
R14304
AB0119
H00031
ACC
ON
or
(-)
DLC 1
(+)
Tc
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-605
833
Author:
Date:
1997 SUPRA (RM502U)
3
Check voltage between terminal Tc of DLC1 and body ground.
CHECK:
Measure the voltage between terminals Tc of DLC1 and body
ground.
OK:
Voltage: 10 - 14 V
OK
Check harness between terminal E
1
of DLC1
and body ground.
NG
AB0117 AB0118 AB0119
W02763
H00049
LOCK
Airbag Sensor Assembly
Tc
ACC
ON
or
DI-606
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
834
Author:
Date:
1997 SUPRA (RM502U)
4
Check airbag sensor assembly.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Remove the steering wheel pad. (See SR section)
(d)
Disconnect the connector of front passenger airbag as-
sembly. (See page
)
(e)
Disconnect the connector of airbag sensor assembly.
(See page
(f)
Insert the service wire into terminal Tc from back side as
shown.
(g)
Connect the airbag sensor assembly connector with ser-
vice wire.
(h)
Connect negative (-) terminal cable to battery.
(i)
Turn the ignition switch to ACC or ON, and wait at least
20 seconds.
(j)
Connect the service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS warning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
OK
Check harness between airbag sensor assem-
bly and DLC1.
NG
Replace airbag sensor assembly.
AB0117
W02764
H00050
LOCK
Airbag Sensor Assembly
(-)
Tc
(+)
-
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI-607
835
Author:
Date:
1997 SUPRA (RM502U)
If the DTC is displayed without a DTC check procedure, perform the following
troubleshooting.
1
Check resistance between terminal Tc of airbag sensor assembly and body
ground.
PREPARATION:
(a)
Turn the ignition switch to LOCK.
(b)
Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c)
Disconnect the airbag sensor assembly connector.
CHECK:
Check the resistance between terminal Tc of airbag sensor as-
sembly connector and body ground.
OK:
Resistance: 1 M
Ω
or higher
NG
Repair or replace harness or connector.
OK
Replace airbag sensor assembly.
DI4WV-01
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom Confirmation
Symptom Simulation
Probkem does not occur
Matrix Chart of Problem Symptoms
Circuit Inspection
Identification of Problem
Repair
Confirmation Test
End
Titles inside
are titles of pages in this
manual, with the page number indicated in
the bottom portion. See the indicated pages
for detailed explanations.
1
2
3
4
5
7
Step 5, 7 : Diagnostic steps permitting the use
of the TOYOTA hand-held tester or
TOYOTA break-out-box.
Problem occurs
6
DI-608
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
836
Author:
Date:
1997 SUPRA (RM502U)
THEFT DETERRENT SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.
For troubleshooting using a volt/ohm meter, see page
.
Be sure to use troubleshooting procedure appropriate to the diagnostic tool being used.
Perform troubleshooting in accordance with the procedure on the following page.
DI4WW-01
THEFT DETERRENT SYSTEM Check Sheet
Inspector’s name:
Customer’s Name
Date of Vehicle
Registration No.
Registration Year
Frame No.
Odometer Reading
/ /
km
Mile
Weather Conditions
When Problem
Occurred
Frequency Problem Occurs
Weather
Outdoor temperature
/ /
Constant
Sometimes ( Times per day, month)
Once only
Brought in
Theft deterrent system cannot be set.
Indicator light does not flash when the theft deterrent system is set.
(It stays on or does not light at all.)
Theft deterrent system
does not operate.
When unlocked using the
door lock knob.
When the engine hood is
opened.
System cannot be
canceled once set.
When door is unlocked using key or wireless door lock control system.
When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.
(However, only when the system has never operated)
When the luggage compartment door is opened with the key.
System cannot be
canceled during warning
operation.
When door is unlocked using key or wireless door lock control system.
When the key is inserted in the ignition key cylinder and turned to ACC or ON
position.
Warning operation starts when the system is set and the door or luggage compartment door is opened with
the key.
Others.
Date Problem First Occurred
Fine
Cloudy
Rainy
Snowy
Various/Others
Hot
Warm
Cool
Cold (Approx.
°
F (
°
C))
Problem Symptom
Malfunction
Horns only
Theft deterrent horn only
Headlights only
Taillights only
Starter cut only
Door lock operation only
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-609
837
Author:
Date:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK
DI4WX-01
DI-610
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
838
Author:
Date:
1997 SUPRA (RM502U)
PRE-CHECK
1.
Setting Conditions:
SETTING OF THE THEFT DETERRENT SYSTEM
(a)
Close all the doors.
(b)
Close the engine hood and luggage compartment door.
(c)
Remove the ignition key from the ignition key cylinder.
2.
Setting Operation:
SETTING OF THE THEFT DETERRENT SYSTEM
When any of the following operations (a) or (c) is done, the theft deterrent indicator light will light up as de-
scribed.
(1)
Lock the left or right front door using the key. (All doors are locked by key-interlinked lock opera-
tion)
(2)
With the rear doors locked and with one of the front doors locked, lock the other front door without
using the key (keyless door lock).
Elapsed time after operation
Indicator light
Within about 30 seconds
Light up
After about 30 seconds
Blinks *
1
*
1
: 1 sec. on, 1 sec. off
HINT:
When the theft deterrent system is set, doors cannot be locked or unlocked with the door lock control switch
and the luggage compartment door cannot be unlocked with the luggage compartment door opener switch.
3.
Cancelling Operation:
CANCELING OF THE THEFT DETERRENT SYSTEM IN THE SET CONDITION
HINT:
Check if the theft deterrent indicator light is blinking.
When any of the following operation (a), (b), (c) or (d) is done, the theft deterrent system is canceled
and indicator light will go off.
(a)
Unlock the left or right front door using the key.
(b)
Insert the ignition key in the ignition key cylinder and turn it to the ACC or ON position. (This is operative
only when the theft deterrent system has never operated.)
(c)
Unlock the luggage compartment door with the key. *
1
*
1
: The theft deterrent systems is temporarily canceled only while the luggage compartment door is open.
Approximately 2 seconds after the luggage compartment door is closed, the theft deterrent system is reset.
N09348
TOYOTA
hand-held tester
TOYOTA
break-out-box
ECU
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-61 1
839
Author:
Date:
1997 SUPRA (RM502U)
4.
CHECK OF THE THEFT DETERRENT SYSTEM OPERATION.
HINT:
Check if the theft deterrent indicator light is blinking.
When any of the following operations (a) or (b) is done, the system sounds the horns as theft deterrent horn
and flashes the headlights and taillights for about one minute to alert. At the same time, the system discon-
nects the starter motor circuit and locks all doors (if all doors are not locked, the system repeats door locking
operation every 2 seconds during the one minute alert time).
(a)
Open the engine hood using the engine hood opener lever.
(b)
Unlock any of the front or rear doors without key operation.
5.
CANCELING OF THE THEFT DETERRENT SYSTEM IN OPERATING CONDITION.
The theft deterrent operation can be cancelled when any of the following conditions is met:
No.
Condition
Cancelling Operation
1
Unlock left or right door with the key.
2
Unlock doors with wireless door lock control system.
3
Insert key into ignition key cylinder and turn it to the ACC or ON position.
*
2
4
About 1 minute passes after theft deterrent operation begins.
Automatic stop*
1
*
1
: In this case, the theft deterrent system resets in about 2 seconds if all doors are closed.
*
2
: The alarm will be off, but the engine will not operate. To restart the engine, see No.1
6.
ECU TERMINAL VALUES MEASUREMENT USING
TOYOTA BRAKE-OUT-BOX AND TOYOTA HAND-
HElD TESTER
(a)
Hook up the TOYOTA brake- out- box and TOYOTA
hand-held tester to the vehicle.
(b)
Read the ECU input/output values by following the
prompts on the hand-held tester screen.
HINT:
TOYOTA hand-held tester has a ”Snapshot” function. This re-
cords the measured values and is effective in the diagnosis of
intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break-
out-box operator’s manual for further details.
DI4WY-01
I02535
Theft Deterrent Horn
R/B No.2
Headlight Relay
Horn Relay
Starter Relay
Engine Hood Courtesy
Switch
Horn
Theft Deterrent Horn
(2JZ-GTE)
(2JZ-GE)
Theft Deterrent and Door
Lock ECU
Door Key Lock and Unlock
Switch
Door Lock Control Switch
Door Lock Motor and Door Unlock
Detection Switch
Door Courtesy Switch
Luggage Room Light Switch
Door Key Lock and Unlock
Switch
Door Lock Control Switch
Back Door Key Unlock Switch
(Power Window Master Switch)
DI-612
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
840
Author:
Date:
1997 SUPRA (RM502U)
PARTS LOCATION
DI4WZ-01
I02536
3
25
2 1
9
7 6
4
11 10
2423
18
8
5
22 21 2019
17 16 151413 12
9 8 7
6 5 4 3 2
1
T13
T7
Theft Deterrent and Door Lock Control ECU
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-613
841
Author:
Date:
1997 SUPRA (RM502U)
TERMINALS OF ECM
Terminals
Symbols
Condition
Standard Value
+B2
↔
Ground
(T7-9
↔
Ground)
L-W
↔
Ground
Always.
10 - 14 V
ACT
-
↔
ACT
+
(T7-2
↔
T7-3)
L-Y
↔
L-R
Ignition switch is turned to ”OFF” position.
Below 50
Ω
RLY
↔
Ground
(T7-6
↔
Ground)
Y
↔
Ground
Ignition switch is turned to ”ON” position.
10 - 14 V
IG
↔
Ground
(T7-7
↔
Ground)
B-R
↔
Ground
Ignition switch is turned to ”ON” position.
10 - 14 V
ACC
↔
E (T7-8
↔
T7-4)
L-R
↔
W-B
Ignition switch is turned to ”ACC” position.
10 - 14 V
+B1
↔
Ground
(T13-1
↔
Ground)
R
↔
Ground
Always.
10 - 14 V
DSWL
E (T13 4
T7 4)
LG
W B
Luggage compartment door courtesy switch ON (door opened).
Below 1
Ω
DSWL
↔
E (T13-4
↔
T7-4)
LG
↔
W-B
Luggage compartment door courtesy switch OFF (door closed).
1 M
Ω
or higher
L1
E (T13 5
T7 4)
R W
W B
Door lock control switch ”lock” position.
Below 1
Ω
L1
↔
E (T13-5
↔
T7-4)
R-W
↔
W-B
Door lock control switch OFF or ”unlock” position.
1 M
Ω
or higher
UL3
E (T13 6
T7 4)
G
W B
Door key lock and unlock switch ”unlock” position.
Below 1
Ω
UL3
↔
E (T13-6
↔
T7-4)
G
↔
W-B
Door key lock and unlock switch OFF or ”lock” position.
1M
Ω
or higher
DSWD
E (T13 7
T7 4)
R B
W B
Door open detection switch (driver’s) ON (door opened).
Below 1
Ω
DSWD
↔
E (T13-7
↔
T7-4)
R-B
↔
W-B
Door open detection switch (driver’s) OFF (door closed).
1M
Ω
or higher
UL1
E (T13 8
T7 4)
G R
W B
Door lock control switch ”unlock” position.
Below 1
Ω
UL1
↔
E (T13-8
↔
T7-4)
G-R
↔
W-B
Door lock control switch OFF or ”lock” position.
1M
Ω
or higher
LUG
E (T13 9
T7 4)
L
W B
Luggage compartment door key lock and unlock switch ON.
Below 1
Ω
LUG
↔
E (T13-9
↔
T7-4)
L
↔
W-B
Luggage compartment door key lock and unlock switch OFF.
1M
Ω
or higher
HEAD
↔
E (T13-10
↔
T7-4)
R-Y
↔
W-B
Light control switch other than ”HEAD” position.
10 - 14 V
SH
↔
E (T13-11
↔
T7-4)
P-B
↔
W-B
Always.
10 - 14 V
IND
↔
Ground
(T13-12
↔
Ground)
W-L
↔
Ground
Always.
Below 270
Ω
DSWH
E (T13 14
T7 4)
G R
W B
Engine hood courtesy switch ON (hood opened).
Below 1
Ω
DSWH
↔
E (T13-14
↔
T7-4)
G-R
↔
W-B
Engine hood courtesy switch OFF (hood closed).
1M
Ω
or higher
LSWD
E (T13 15
T7 4)
L W
W B
Door unlock detection switch ON (door opened).
Below 1
Ω
LSWD
↔
E (T13-15
↔
T7-4)
L-W
↔
W-B
Door unlock detection switch OFF (door closed).
1M
Ω
or higher
UL2
E (T13 16
T7 4)
W
W B
Door key lock and unlock switch ”unlock” position.
Below 1
Ω
UL2
↔
E (T13-16
↔
T7-4)
W
↔
W-B
Door key lock and unlock switch OFF or ”lock” position.
1M
Ω
or higher
DSWP
E (T13 19
T7 4)
R L
W B
Door open detection switch (passenger’s) ON (door opened).
Below 1
Ω
DSWP
↔
E (T13-19
↔
T7-4)
R-L
↔
W-B
Door open detection switch (passenger’s) OFF (door closed).
1M
Ω
or higher
KSW
E (T13 20
T7 4)
Y
W B
Key unlock warning switch ON.
Below 1
Ω
KSW
↔
E (T13-20
↔
T7-4)
Y
↔
W-B
Key unlock warning switch OFF.
1M
Ω
or higher
DI-614
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
842
Author:
Date:
1997 SUPRA (RM502U)
LSWP
E (T13 21
T7 4)
G B
W B
Door unlock detection switch ON (door opened).
Below 1
Ω
LSWP
↔
E (T13-21
↔
T7-4)
G-B
↔
W-B
Door unlock detection switch OFF (door closed).
1M
Ω
or higher
L2
E (T13 22
T7 4)
G Y
W B
Door key lock and unlock switch ”lock” position.
Below 1
Ω
L2
↔
E (T13-22
↔
T7-4)
G-Y
↔
W-B
Door key lock and unlock switch OFF or ”unlock” position.
1M
Ω
or higher
TAIL
↔
E (T13-23
↔
T7-4)
G-W
↔
W-B
Light control switch ”TAIL” position.
10 - 14 V
HORN
↔
E (T13-24
↔
T7-4)
L-R
↔
W-B
Horn switch OFF.
10 - 14 V
SRLY
↔
Ground
(T13-25
↔
Ground)
L-O
↔
Ground
Ignition switch is turned to ”ST” position.
(When park/neutral position switch ”P” position.)
10 - 14 V
DI4X0-01
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-615
843
Author:
Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
Proceed to the reference page shown in the matrix chart below for each malfunction symptom and trouble-
shoot for each circuit.
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.
Theft Deterrent System:
Details of Problem
Inspecting Circuit *
1
See page
1. Indicator light circuit
2. Luggage compartment door key lock and unlock switch
circuit
The theft deterrent system cannot be set
3. Luggage compartment door courtesy switch circuit
4. Door courtesy switch circuit
5. Engine hood courtesy switch circuit
The indicator light does not blink when system is set
Indicator light circuit
When the system is set
When the back door is opened by a method other than the key
The system does not operate
Luggage compartment door courtesy switch circuit
When the system is set
When the engine hood is opened
The system does not operate
Engine hood courtesy switch circuit
While the system is in warning operation
Horns do not sound
Horn relay circuit
While the system is in warning operation
Theft deterrent horn does not sound
Theft deterrent horn circuit
While the system is in warning operation
Headlights do not flash
Headlight control relay circuit
While the system is in warning operation
Taillights do not flash
Taillight control relay circuit
While the system is in warning operation
The starter cut is not cut off
Starter relay circuit
When the system is set
It is not canceled when the ignition key is turned to ACC or ON
position
Ignition switch circuit
When the system is set
It still operates when the back door is opened with the key
Luggage compartment door key lock and unlock switch
circuit
System is still set even when a rear door is open
Door courtesy switch circuit
Even when the system is not set
Horns sound
Horn relay circuit
Even when the system is not set
Theft deterrent horn sounds
Theft deterrent horn circuit
Even when the system is not set
Headlights stay on
Headlight control relay circuit
Even when the system is not set
Taillights stay on
Taillight control relay circuit
*
1:
If numbers are given to the circuit proceed with troubleshooting in the order indicated by those numbers.
DI-616
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
844
Author:
Date:
1997 SUPRA (RM502U)
Door Lock System:
Trouble
Suspect Area
See page
Whole function of the door lock control system does not operate.
1. ECU Power Source Circuit
2. Actuator Power Source Circuit
3. Door Lock Motor Circuit
4. Theft Deterrent and Door Lock Control ECU
All doors or some doors are not locked and unlocked with the
door lock control switch and key lock and unlock switch.
1. Door Lock Control Switch Circuit
2. Door key Lock and Unlock Switch Circuit
3. Door Lock Motor Circuit
4. Theft Deterrent and Door Lock Control ECU
Doors cannot be locked with the door lock control switch. (Doors
lock and unlock normally with the key lock and unlock switch.)
1. Door Lock Control Switch Circuit
2. Key Unlock Warning Switch Circuit
3. Door Courtesy Switch Circuit
4. Theft Deterrent and Door Lock Control ECU
Doors are not locked or unlocked with the door key lock and un-
lock switch. (Doors lock and unlock normally with the door lock
control switch.)
1. Door Key Lock and Unlock Switch Circuit
2.Theft Deterrent and Door Lock Control ECU
Key confinement prevention function does not operate. (Doors
lock and unlock normally with the door key lock and unlock
switch.)
1. Key Unlock Warning Switch Circuit
2. Door Unlock Detection Switch CIrcuit
3. Theft Deterrent and Door Lock Control ECU
DI4X1-01
I02537
Indicator Light
(Telltale Light LH)
Theft Deterrent and
Door Lock ECU
W-L
W-B
9
12
IE
J/B No.1
1 1J
IE
T13
10
IND
18
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-617
845
Author:
Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
Indicator Light Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is preparing to set, this circuit lights up the indicator light. When the system
has been set, it continually turns the indicator light on for 1 second and turns it off for 1 second, thus blinking
the indicator light.
WIRING DIAGRAM
I02538
10 (+)
9 (-)
DI-618
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
846
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check indicator light.
PREPARATION:
(a)
Remove instrument panel cluster finish panel.
(b)
Disconnect telltale light RH connector.
CHECK:
Connect positive
lead to terminal 10 and negative
lead to
terminal 9 of indicator light connector.
OK:
Indicator light comes on.
NG
Replace telltale light RH.
OK
2
Check harness and connector between theft deterrent and door lock ECU and
indicator light, indicator light and body ground (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace theft deterrent and door
lock ECU. *
1
*
1:
When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown on matrix chart (See page
N19900
1K
1J
IJ2
P2
P2
C9
C9
IJ1
EA1
2
2
2
IB2
IF2
I19
I19
IB1
2
2A
S2
S3
4
6
8
7
B
13
6
5
1
2
2
3
1
2
3
5
10
Theft Deterrent and
Door Lock ECU
EA2
EA3
4
Starter Relay
MAIN
L-O
SRLY
25
Clutch Start Switch
(M/T)
2
1
AM2
J/B No.1
ST
R/B No.2
2
1
2JZ-GTE
2JZ-GE
Battery
1
2
B
B
L-O
L-O
B-W
B-W
W-R
W-R
W-B
B
B
B
1
Ignition
Switch
T13
Park/Neutral Start Switch
1
1
B
(A/T)
12
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-619
847
Author:
Date:
1997 SUPRA (RM502U)
Starter Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact ”a” in the ECU becomes open, creating an open circuit
in terminal ST circuit and making the starter inoperative (starter cut).
In this condition, if one of the following operations is done, the contact ”a” in the ECU is grounded, thus can-
celing the starter cut:
(1)
The front LH and RH door is unlocked with a key.
WIRING DIAGRAM
DI4X2-01
I02540
START
Disconnect
SPLY (+)
DI-620
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
848
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
This troubleshooting is based on the premise that engine cranking occurs.
If the engine does not crank, proceed to the engine troubleshooting on page
(Vol. 1).
1
Check voltage between terminal SRLY of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a)
Remove the instrument panel. (See page
)
(b)
Disconnect the ECU connector.
CHECK:
Measure voltage between terminal SRLY of theft deterrent ECU
connector and body ground, when ignition switch is turned to
ST position.
OK:
Voltage: 10 - 14 V
OK
Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between starter and theft deterrent and door lock ECU
(See page
).
I02710
I02710
Theft Deterrent and
Door Lock ECU
R/B No.2
HORN Relay
R/B No2.
Horn Switch
Horn
L-R
L-B
HAZ-HORN
Battery
HORN
L-B
L-R
L-R
W
2
2
2
2
2
2A
1
1
1
1
16
14
L-R
L-B
3
IB2
IF2
24
B
T13
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-621
849
Author:
Date:
1997 SUPRA (RM502U)
Horn Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off in approximately
0.2 sec. cycles. This switches the horn relay on and off, thus the horn blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the horn relay
switches off, thus the horns stop blowing:
(1)
The front LH or RH door is unlocked with a key.
(2)
The ignition switch is turned to the ACC or ON position.
(3)
Approximately 1 minute elapses.
WIRING DIAGRAM
DI4X3-01
I02711
LOCK
Disconnect
HORN (+)
DI-622
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
850
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminal HORN of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a)
Remove the instrument panel. (See page
).
(b)
Disconnect the ECU connector.
CHECK:
Measure voltage between terminal HORN of theft deterrent
ECU connector and body ground.
OK:
Voltage : 10 - 14 V
OK
Check and replace theft deterrent and door lock
ECU.
NG
Check and repair harness and connector between theft deterrent and door lock ECU and horn
relay (See page
N09783
2
2A
EA1
II1
IB6
IF2
19
6
22
7
1
2
1
Battery
R/B No.2
HAZ-HORN
W
(2JZ-GE)
Theft Deterrent and
Door Lock ECU
T13
(2JZ-GE)
11
(2JZ-GTE)
Theft Deterrent
Horn
(2JZ-GTE)
B
P-B
W
W
W-L
W-L
SH
a
b
P-B
W-L
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-623
851
Author:
Date:
1997 SUPRA (RM502U)
Theft Deterrent Horn Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, contact ”a” and contact ”b” in the ECU close alternately in cycles
of approximately 0.2 sec., causing the theft deterrent horn to blow (See the wiring diagram below).
In this condition, if any of the following operations is done, the contact ”a” in the ECU opens, thus stopping
the theft deterrent horn from blowing:
(1)
The front LH or RH door is unlocked with a key.
(2)
The ignition switch is turned to the ACC or ON position.
(3)
Approximately 1 minute elapses.
WIRING DIAGRAM
DI4X4-01
I02542
LOCK
Disconnect
2JZ-GE
2JZ-GTE
2 (+)
2 (+)
N14682
1 (+)
2 (-)
DI-624
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
852
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminal SH of theft deterrent horn connector and body
ground.
PREPARATION:
Remove the theft deterrent horn and disconnect the connector.
CHECK:
Measure voltage between terminal 1 of theft deterrent horn
connector and body ground.
OK:
Voltage : 10 - 14 V
NG
Check and repair harness and connector be-
tween HORN fuse and theft deterrent horn.
OK
2
Check theft deterrent horn.
CHECK:
Connect positive
lead to terminal 1 and negative
lead to
terminal 2 of theft deterrent horn connector.
OK:
Theft deterrent horn blows.
NG
Replace theft deterrent horn.
OK
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-625
853
Author:
Date:
1997 SUPRA (RM502U)
3
Check harness and connector between theft deterrent and door lock ECU and
theft deterrent horn (See page
NG
Check and repair harness or connector.
OK
Check and replace theft deterrent ECU.
I02543
Theft Deterrent and
Door Lock ECU
*1: USA Models
*2: CANADA Models
Battery
R/B No.2
HEAD
(LH)*1
HEAD
(LH-L WR)*2
HEAD
R/B No.2
FL MAIN
Light Control
Switch
R/B No.2
HEAD
(RH)*1
HEAD
(RH-L WR)*2
R-Y
R-Y
R-Y
R-Y
R-G
R-B
W-B
W-B
B
R
R
2
2
2
2
2
2
2
2
1
1
1
1
4
2
3
10
16
13
IB2
IF2
2A
EA
Headlight Relay
T13
DI-626
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
854
Author:
Date:
1997 SUPRA (RM502U)
Headlight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately
0.2 sec. intervals. This switches the headlight control relay on and off, thus flashing the headlights (See the
wiring diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the headlight control
relay switches off, thus stopping the headlights flashing:
(1)
The front LH or RH door is unlocked with a key.
(2)
The ignition switch is turned to the ACC or ON position.
(3)
Approximately 1 minute elapses.
WIRING DIAGRAM
DI4X5-01
I02544
LOCK
Disconnect
HEAD (+)
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-627
855
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
The flow chart below is based on the premise that the headlights light up normally whenever the light control
switch is operated. If headlight operation is not normal when the light control switch is operated, proceed
to troubleshooting on page
1
Check voltage between terminal HEAD of theft deterrent and door lock ECU con-
nector and body ground.
PREPARATION:
(a)
Remove the instrument panel. (See page
)
(b)
Disconnect the ECU connector.
CHECK:
Measure voltage between terminal HEAD of theft deterrent
ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK
Check and replace theft deterrent and door lock
ECU.
NG
Check and repair harness and connector between theft deterrent and door lock ECU and head-
light control relay (See page
I02545
I02545
Theft Deterrent and
Door Lock ECU
T13
IF2
2
2
2A
2
2
J/B No.1
1B
1K
1C
LG
LG
G-W
G-W
G-W
TAIL
11
16
3
5
TAIL
1
W-L
W-B
T a i l
Light
W-B
W-B
1
1
9
3
B
Battery
Light
Failure
Sensor
Light Control Switch
15
23
G
Taillight Control Relay
B1
BJ
AL
T
POWER
W
1
5
5
2
DI-628
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
856
Author:
Date:
1997 SUPRA (RM502U)
Taillight Control Relay Circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is activated, it causes the Tr in the ECU to switch on and off at approximately
0.2 sec. intervals. This switches the taillight control relay on and off, thus the taillights flash (See the wiring
diagram below).
In this condition, if any of the following operations is done, the Tr in the ECU goes off and the taillight control
relay switches off, thus stopping the taillights flashing:
(1)
The front LH or RH door is unlocked with a key.
(2)
The ignition switch is turned to the ACC or ON position.
(3)
Approximately 1 minute elapses.
WIRING DIAGRAM
DI4X6-01
I02546
LOCK
Disconnect
TAIL (+)
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-629
857
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminal TAIL of theft deterrent door lock ECU connector
and body ground.
PREPARATION:
(a)
Remove the instrument panel. (See page
)
(b)
Disconnect the ECU connector.
CHECK:
Measure voltage between terminal TAIL of theft deterrent and
door lock ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK
Check and replace theft deterrent ECU.
NG
Check and repair harness and connector between theft deterrent and door lock ECU and taillight
control relay (See page
I02547
Theft Deterrent and
Door Lock ECU
J/B No.1
Ignition Switch
R/B No.2
R/B No.2
Battery
AM1
AL
T
4
CIG
W
T7
J/B No.1
W
4
4
2
3
2
8
5
8
7
17
1B
1J
2
2
2
1 2A
W
B
ACC
L-R
B-R
P-L
B-Y
IG
1E
1E
1J
1J
ECU-IG
DI-630
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
858
Author:
Date:
1997 SUPRA (RM502U)
Ignition Switch Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU. Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the
terminals ACC and IG of the ECU. When the battery positive voltage is applied to the terminal ACC of the
ECU while the theft deterrent system is activated, the warning stops. Furthermore, power supplied from the
terminals ACC and IG of the ECU is used as power for the door courtesy switch, and position switch, etc.
WIRING DIAGRAM
DI4X7-01
N08843
N14677
I04612
ECU-IG
CIG
Junciton Block No.1
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-631
859
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check CIG and ECU-IG fuses.
PREPARATION:
Remove CIG and ECU-IG fuses from J/B No.1.
CHECK:
Check continuity of CIG and ECU-IG fuses.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to the CIG and ECU-IG fuses
(See attached wiring diagram).
OK
I02548
ON
Disconnect
IG (+)
ACC (+)
DI-632
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
860
Author:
Date:
1997 SUPRA (RM502U)
2
Check voltage between terminals IG and ACC of theft deterrent and door lock
ECU and body ground.
PREPARATION:
(a)
Remove the instrument panel. (See page
)
(b)
Disconnect the ECU connector.
(c)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals IG and ACC of theft deter-
rent ECU connector and body ground.
OK:
Voltage: 10 - 14 V
OK
Check and replace theft deterrent and door lock
ECU.
NG
Check and repair harness and connector between theft deterrent and door lock ECU and battery
(See page
).
I02552
Luggage Compartment Door
Courtesy Switch
Theft Deterrent and
Door Lock ECU
8
LG
IE1
DSWL
4
12V
1
T13
LG
DI-636
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
864
Author:
Date:
1997 SUPRA (RM502U)
Luggage Compartment Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The luggage compartment door courtesy switch goes on when the back door is opened and goes off when
the back door is closed.
WIRING DIAGRAM
DI4X9-01
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-637
865
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check operation of luggage room light.
CHECK:
Check that luggage room light goes off when luggage room light switch is pushed, and comes on when switch
is not pushed.
NG
Check and repair luggage compartment door
courtesy light circuit (See page
OK
2
Check for open in harness and connector between theft deterrent and door lock
ECU and luggage compartment door courtesy switch (See page
NG
Repair or replace harness or connectors.
OK
Check and replace theft deterrent ECU. *
1
*
1
: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown on matrix chart (See page
I02553
Door Lock Motor and Unlock
Detection Switch RH
Theft Deterrent and
Door Lock ECU
Door Lock Motor and Unlock
Detection Switch LH
W-B
W-B
L-Y
LSWD
L-W
L-W
W-B
IH
IE
IL1
IJ
ID
IL1
ID1
8
21
1
1
6
15
1
10
16
4
2
3
2
4
12V
12V
T13
3
W-B
G-B
G-B
LSWP
DI-638
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
866
Author:
Date:
1997 SUPRA (RM502U)
Door Unlock Detection Switch Circuit
CIRCUIT DESCRIPTION
The door unlock detection switch goes off when the door lock knob is operated to the lock position, and
comes on when the door lock knob is operated to the unlock position.
WIRING DIAGRAM
DI4XA-01
I02554
Disconnect
1
3
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-639
867
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check door unlock detection switch.
PREPARATION:
(a)
Remove the door trim.
(b)
Disconnect door lock motor and door unlock detection
switch connector.
CHECK:
Check continuity between terminals 1 and 3 of door unlock
detection switch connector, when door lock knob is operated to
the lock side and to the unlock side.
OK:
Switch condition
Terminal No. to continuity
Door unlock
1 - 3
Door lock
-
NG
Replace door unlock detection switch.
OK
2
Check harness and connector between theft deterrent and door lock ECU and
door unlock detection switch, door unlock detection switch and body ground
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace theft deterrent and door
lock ECU. *
1
*
1
: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown on matrix chart (See page
I02555
Door Courtesy Switch LH
Door Courtesy
Switch RH
Theft Deterrent and
Door Lock ECU
W-B
R-B
R-B
R-B DSWD
DSWP
R-L
R-L
W-B
2
3
3
3
2
4
7
15
19
IC2
IF2
IF3
12V
12V
T13
BI
IG
DI-640
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
868
Author:
Date:
1997 SUPRA (RM502U)
Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The door courtesy switch goes on when the door is opened and goes off when the door is closed.
WIRING DIAGRAM
DI4XB-01
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-641
869
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check operation of open door warning light.
CHECK:
Check that open door warning light comes on when each door is opened, and goes off when all doors are
closed.
NG
Check and repair open door warning light
circuit.
OK
2
Check for open in harness and connector between theft deterrent and door lock
ECU and door courtesy switch (See page
OK
Check and replace theft deterrent ECU. *
1
NG
Repair or replace harness or connector.
*
1
: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown on matrix chart (See page
I02556
Engine Hood Courtesy
Switch
Theft Deterrent and
Door Lock ECU
W-B
GR
DSWH
GR
14
12V
GR
EA
IB6
IF3
2
1
4
9
T13
DI-642
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
870
Author:
Date:
1997 SUPRA (RM502U)
Engine Hood Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The engine hood courtesy switch is built into the engine hood lock assembly and goes on when the engine
hood is opened and goes off when the engine hood is closed.
WIRING DIAGRAM
DI4XC-01
I02557
1
2
Disconnect
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-643
871
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check engine hood courtesy switch.
PREPARATION:
(a)
Remove engine hood lock assembly.
(b)
Disconnect engine hood courtesy switch connector.
CHECK:
Check continuity between terminals 1 and 2 when engine hood
lock is locked and unlocked.
OK:
Engine hood lock
Terminal No. to continuity
Lock
-
Unlock
1 - 2
NG
Replace engine hood courtesy switch.
OK
2
Check harness and connector between theft deterrent and door lock ECU and
switch, switch and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace theft deterrent and door
lock ECU (See page
I02549
Luggage Compartment Door
Key Lock and Unlock Swich
Theft Deterrent and Door Lock ECU
LUG
IE1
W-B
BJ
1
L
4
L
9
12V
T13
2
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-633
861
Author:
Date:
1997 SUPRA (RM502U)
Luggage Compartment Door Key Lock and Unlock Switch
Circuit
CIRCUIT DESCRIPTION
The luggage compartment door key lock and unlock switch goes on when the back door key cylinder is
turned to the unlock side with the key.
WIRING DIAGRAM
DI4X8-01
I02550
1 (+)
ON
Connect
I02551
Disconnect
1
2
DI-634
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
862
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminal 1 of luggage compartment door key lock and
unlock switch connector and body ground.
PREPARATION:
(a)
Remove deck trim rear cover.
(b)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 1 of luggage compartment
door key lock and unlock switch connector and body ground,
when the key is turned to the unlock side and not turned.
OK:
Key operation
Voltage
Turned to the unlock side
0 V
Not turned
Battery positive voltage
OK
Check and replace theft deterrent and door lock
ECU. *
1
NG
2
Check luggage compartment door key lock and unlock switch.
PREPARATION:
Disconnect luggage compartment door key lock and unlock
switch connector.
CHECK:
Check continuity between terminals 1 and 2, when the key is
turned to the unlock side and not turned.
OK:
Key position
Terminal No. to continuity
Turned to unlock side
1 - 2
Not turned
-
NG
Repair or replace luggage compartment door
key lock and unlock switch.
OK
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-635
863
Author:
Date:
1997 SUPRA (RM502U)
3
Check harness and connector between theft deterrent and door lock ECU and
key unlock switch, key unlock switch and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace theft deterrent and door
lock ECU.
*
1
: When there is a malfunction that the theft deterrent system cannot be set, proceed to the next numbered
circuit inspection shown on matrix chart (See page
I02558
I02558
Theft Deterrent and
Door Lock ECU
Battery
R/B No.2
J/B No.1
DOME
R
+B1
W-B
E
4
1
R
5
1
2
B
2A
1B
1E
11
IH
T13
T7
DI-644
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
872
Author:
Date:
1997 SUPRA (RM502U)
ECU Power Source-Circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the theft deterrent and door lock ECU.
WIRING DIAGRAM
DI4XD-01
N09001
Relay Block No.2
DOME Fuse
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-645
873
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check DOME fuse.
PREPARATION:
Remove DOME fuse from R/B No.2.
CHECK:
Check continuity of DOME fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to the DOME fuse
(See attached wiring diagram).
OK
I02559
LOCK
E (-)
+B1 (+)
DI-646
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
874
Author:
Date:
1997 SUPRA (RM502U)
2
Check voltage between terminals +B1 and E of ECU connector.
PREPARATION:
(a)
Remove the No.1 under cover and heater duct.
(b)
Disconnect the theft deterrent and door lock ECU con-
nectors.
CHECK:
Measure voltage between terminals +B1 and E of ECU connec-
tor.
OK:
Voltage: 10 - 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
3
Check for open in harness and connector between ECU and body ground
(See page
).
NG
Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween ECU and battery (See page
I02560
J/B No.1 DOOR Fuse
Theft Deterrent and
Door Lock ECU
Door Lock Motor
T7
12V
L-W
L-W
+B2
9
13
IF1
W-L
R/B No.2
R/B No.2
POWER
AL
T
B
W
Battery
1B
1H
2
15
2
2
2
2A
1
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-647
875
Author:
Date:
1997 SUPRA (RM502U)
Actuator Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to drive the door lock motor.
WIRING DIAGRAM
DI4XE-01
N09001
Relay Block No.2
POWER M-Fuse
DI-648
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
876
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check POWER M-fuse.
PREPARATION:
Remove POWER M fuse from R/B No.2.
CHECK:
Check continuity of POWER M-fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to the DOOR fusible link
(See attached wiring diagram). *
1
OK
I02561
LOCK
+B2 (+)
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-649
877
Author:
Date:
1997 SUPRA (RM502U)
2
Check voltage between terminal +B2 of ECU connector and body ground.
PREPARATION:
(a)
Remove the instrument panel. (See page
)
(b)
Disconnect the ECU connector.
CHECK:
Measure voltage between terminal +B2 of ECU connector and
body ground.
OK:
Voltage: 10 - 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
Check and repair harness and connector be-
tween ECU and battery (See page
*1: The power source is supplied to the actuator (door lock motor, through the theft deterrent and door lock
ECU. Accordingly, if a short circuit of the W/H or actuator occurs in the actuator circuit the POWER M-Fuse
may become OPEN, so also inspect the actuator (door lock motor circuit on page
).
I02562
Door Lock Motor RH
Door Lock Motor LH
Theft Deterrent and
Door Lock ECU
L-Y
L-Y
L-Y
L-Y
L-R
L-R
L-R
L-R
ACT
+
3
12V
12V
ACT
-
2
L-Y
T7
12
IL1
2
4
11
IL1
5
ID1
16
ID1
4
2
DI-650
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
878
Author:
Date:
1997 SUPRA (RM502U)
Door Lock Motor Circuit
CIRCUIT DESCRIPTION
This door lock motor locks and unlocks the door according to signals from the ECU.
WIRING DIAGRAM
DI4XF-01
N08716
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-651
879
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check operating sound of door lock motor.
CHECK:
Check operating sound of door lock motor, when door lock con-
trol switch is pushed to the lock side and unlock side.
OK:
Can hear operating sound of door lock motor.
HINT:
Inspect the door which is malfunctioning.
OK
Repair or replace door lock control link.
NG
N16142
N16142
N16142
N16142
I04613
Driver’s Side
Passenger’s Side
2 (+)
2 (-)
2 (-)
2 (+)
Lock
Unlock
Passenger’s Side
Driver’s Side
4 (-)
4 (+)
4 (+)
4 (-)
DI-652
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
880
Author:
Date:
1997 SUPRA (RM502U)
2
Check door lock motor.
PREPARATION:
(a)
Remove the door trim and service hole cover.
(b)
Disconnect the door lock motor connector.
CHECK:
(a)
Connect positive
lead to terminal 2 (4) and negative
lead to terminal 4 (2) of door lock motor connector.
(b)
Connect positive
lead to terminal 4 (2) and negative
lead to terminal 2 (4) of door lock motor connector.
( ): Passenger’s Side.
OK:
(1) Door lock motor locks door.
(2) Door lock motor unlocks door.
HINT:
This inspection must be carried out within 2 seconds.
OK
Replace door lock motor.
NG
3
Check harness and connectors between ECU and door lock motor
(See page
).
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
).
I02563
Door Lock Control Switch LH
(Power Window Master Switch)
Theft Deterrent and
Door Lock ECU
Door Lock Control Switch RH
T13
12V
R-W
G-R
L1
5
UL1
8
J/B No.1
W-B
W-B
W-B
R-W
G-R
R-W
G-R
G-R
R-W
W-B
IL1
IL1
IL1
ID1
ID1
7
1
2
1
10
1
16
4
2
3
10
9
IJ
ID
8
IH
IE
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-653
881
Author:
Date:
1997 SUPRA (RM502U)
Door Lock Control Switch Circuit
CIRCUIT DESCRIPTION
When the door lock control switch is pushed to the lock side, Lock terminal of the switch is grounded, and
when the switch is pushed to the unlock side, unlock terminal is grounded (See wiring diagram below).
WIRING DIAGRAM
DI4XG-01
I02564
ON
2 (+)
1 (+)
3 (+)
1 (+)
LH
RH
(+)
(-)
DI-654
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
882
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminals 2(3), 1(1) of door lock control switch connector
and body ground.
PREPARATION:
Remove the door trim.
CHECK:
(a)
Turn the ignition switch ON.
(b)
Measure voltage between terminals 2(3), 1(1) of door lock
control switch connector and body ground, when door
lock control switch is pressed to the lock side, unlock side
and OFF position.
OK:
Switch position
Terminal 2(3)
Terminal 1(1)
Lock side
Below 1 V
8 - 10 V
Unlock side
8 - 10 V
Below 1 V
OFF
8 - 10 V
8 - 10 V
HINT:
The terminal number without brackets is for the LH, the number
with brackets is for the RH.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
I02565
2
1
8
2
LH
RH
3
4
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-655
883
Author:
Date:
1997 SUPRA (RM502U)
2
Check door lock control switch.
PREPARATION:
Disconnect the door lock control switch connector.
CHECK:
Check continuity between terminals 2(3), 1(2), 8(4) of door lock
control switch connector, when door lock control switch is
pressed to the lock side, and unlock side and OFF position.
OK:
Switch position
Terminal No. to continuity
Lock side
2(3) - 8(4)
Unlock side
1(2) - 8(4)
OFF
HINT:
The terminal number without brackets is for the LH, the number
with brackets is for the RH.
NG
Replace door lock control switch.
OK
3
Check harness and connectors between ECU and door lock control switch,
switch and body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace ECU. *1
*1: Malfunction of the ECU can be considered possible only when the problem symptom as follows:
Lock and/or unlock using the Door Lock Control Switch cannot be done, neither on the driver’s side nor
on the passenger’s side.
I02566
Door Key Lock and
Unlock Switch LH
Theft Deterrent and
Door Lock ECU
Door Key Lock and
Unlock Switch RH
J/B No.1
W-B
W-B
T13
W-B
W-B
G-Y
W
W
G-Y
G-Y
G-Y
G
UL3
L2
UL2
W
12V
12V
1J
1
1D
10
IL1
16
1
2
2
1
3
3
ID1
ID1
IL1
IL1
2
7
3
13
6
22
16
IE
IH
DI-656
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
884
Author:
Date:
1997 SUPRA (RM502U)
Door Key Lock and Unlock Switch Circuit
CIRCUIT DESCRIPTION
The door key lock and unlock switch is built in the door key cylinder.
When the key is turned to the lock side, terminal 3 of the switch is grounded and when the key is turned to
the unlock side, terminal 1 of the switch is grounded.
WIRING DIAGRAM
DI4XH-01
N16147
2
3
1
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-657
885
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check door key lock and unlock switch.
PREPARATION:
(a)
Remove the door trim and service hole cover.
(b)
Disconnect the door key lock and unlock switch connec-
tor.
CHECK:
Check continuity between terminals 1, 2 and 3 of door key lock
and unlock switch connector, when door key lock and unlock
switch is turned to the lock side, unlock side and when it is not
turned.
OK:
Switch position
Terminal No. to continuity
Lock side
2 - 3
Unlock side
1 - 3
OFF
-
NG
Replace door key lock and unlock switch.
OK
2
Check harness and connectors between ECU and switch, switch and body
ground (See page
).
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
).
I02567
I02567
Theft Deterrent and
Door Lock ECU
Key Unlock Warning
Switch
T13
12V
Y
20
KSW
IF1
Y
11
2
1
W-B
J/B No.1
W-B
1K
1J
12
1
IE
DI-658
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
886
Author:
Date:
1997 SUPRA (RM502U)
Key Unlock Warning Switch Circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when
the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is on.
WIRING DIAGRAM
DI4XI-01
I02712
Disconnect
1
2
-
DIAGNOSTICS
THEFT DETERRENT SYSTEM
DI-659
887
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check key unlock warning switch.
PREPARATION:
Disconnect key unlock warning switch connector.
CHECK:
Check continuity between terminal 1 and 2 of key unlock warn-
ing switch connector, when the key is inserted to the key cylin-
der or removed.
OK:
Switch position
Terminal No. to continuity
ON (Key inserted)
1 - 2
OFF (Key removed)
-
NG
Replace key unlock warning switch.
OK
2
Check harness and connectors between ECU and key unlock warning switch,
key unlock warning switch and body ground (See page
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
).
DI4XJ-01
Customer Problem Analysis Check
Check and Clear DTC (Precheck)
Vehicle Brought to Workshop
Problem Symptom Confirmation
Symptom Simulation
Symptom does not occur
DTC Check
Normal code
DTC Chart
Problem Symptoms Table
Circuit Inspection
Input Signal Check
Parts Inspection
Identification of Problem
Repair
Confirmation Test or Road Test *
End
Items inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations.
1
2
3
4
5
6
7
8
9
10
Step 2, 5, 8, 10: Diagnostic steps permitting the use
of the TOYOTA hand-held tester or
TOYOTA break-out-box.
OK
NG
Malfunction code
Clear DTC
P.
*: See next page
DI-660
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
888
Author:
Date:
1997 SUPRA (RM502U)
CRUISE CONTROL SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following page.
DI4XK-01
CRUISE CONTROL SYSTEM Check Sheet
Inspector’s name:
Customer’s Name
Date of Vehicle
Registration No.
Registration Year
Frame No.
Odometer Reading
/ /
km
Mile
Condition of
Problem Occurrence
Date of Problem
How Often does
Occurrence
Problem Occur?
Vehicle Speed when
Problem Occurred
/ /
Continuous Intermittent ( Times a day)
km
Mile
Brought in
Auto cancel
occurs
Driving condition
City driving
Freeway
Up hill
Down hill
After cancel occurred, did the driver activate cruise control
again?
Yes
No
Cancel does not
occur
With brake ON
Except D position shift
When control SW turns to CANCEL position
Cruise control
malfunction
Slip to acceleration side
Slip to deceleration side
Hunting occurs
O/D cut off does not occur
O/D does not return
Switch
malfunction
SET
ACCEL
COAST
RESUME
CANCEL
Remains ON
Does not light up
Blinking
Symptoms
DTC Check
1st Time
2nd Time
Normal Code
Malfunction Code (Code )
Normal Code
Malfunction Code (Code )
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-661
889
Author:
Date:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK
N08654
DI4XL-01
BE4034
Indicator Light
1.5 sec.
0.5 sec.
ON
OFF
N19819
DLC1
E
1
Tc
DI-662
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
890
Author:
Date:
1997 SUPRA (RM502U)
PRE-CHECK
1.
DIAGNOSIS SYSTEM
(a)
Check the indicator.
(1)
Turn the ignition switch to ON.
(2)
Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page
) for the combination meter section.
(b)
Clear the DTC.
HINT:
If a malfunction occurs in the No.1 vehicle speed sensors or ac-
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stopped in memory as
a DTC.
(c)
Output of DTC using diagnosis check wire.
(1)
Turn the ignition switch ON.
(2)
Using SST, connect terminals Tc and E
1
of DLC1.
SST
09843-18020
(3)
Read the DTC on the CRUISE MAIN indicator light.
BE4032
BE4033
I00021
0.25 sec.
0.25 sec.
Normal Code
Malfunction codes 11 and 21
4 sec.
0.5 sec.
1.5 sec.
1.5 sec.
0.5 sec.
2.5 sec.
ON
OFF
Code 11
Code 21
ON
OFF
N09348
TOYOTA Hand-Held Tester
TOYOTA Break-out-box
N09001
DOME Fuse
R/B No.2
I02735
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-663
891
Author:
Date:
1997 SUPRA (RM502U)
HINT:
If the DTC is not output, inspect the diagnosis circuit (See
page
As an example, the blinking patterns for codes; normal,
11 and 21 are shown in the illustration.
2.
ECU TERMINAL VALUES MEASUREMENT BY USING
TOYOTA BRAKE-OUT-BOX AND TOYOTA HAND-
HELD TESTER
(a)
Hook up the TOYOTA break- out- box and TOYOTA
hand-held tester to the vehicle.
(b)
Read the ECU input/output values by following the
prompts on the tester screen.
(c)
Please refer to the TOYOTA hand-held tester has a
”Snapshot” function. This records the measured data and
is effective in the diagnosis of intermittent problems.
3.
DTC CLEARANCE
(a)
After completing repairs, the DTC retained in memory can
be cleared by removing the DOME fuse for 10 seconds or
more, with the ignition switch off.
(b)
Check that the normal code is displayed after connecting
the fuse.
4.
PROBLEM SYMPTOM CONFIRMATION (Road Test)
(a)
Inspection the SET switch.
(1)
Push the main switch ON.
(2)
Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3)
Press the control switch to the SET/COAST.
(4)
After releasing the switch, check that the vehicle
cruises at the desired speed.
I02735
I02735
DI-664
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
892
Author:
Date:
1997 SUPRA (RM502U)
(b)
Inspect the ACCEL switch.
(1)
Push the main switch ON.
(2)
Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3)
Check that the vehicle speed is increased while the
control switch turned to RES/ACC, and that the ve-
hicle cruise at the set speed when the switch is re-
leased.
(4)
Momentarily press the control switch upward in the
RES/ACC and then immediately release it. Check
that the vehicle speed increases by about 1.5 km/h
(Tap-up function).
(c)
Inspect the COAST switch.
(1)
Push the main switch ON.
(2)
Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3)
Check that the vehicle speed is decreased while the
control switch is turned to SET/COAST, and the ve-
hicle cruise at the set speed when the switch is re-
leased.
(4)
Momentarily press the control switch is turned to
SET/COAST, and then immediately release it.
Check that the vehicle speed decreases by about
1.5 km/h (Tap-down function).
I02735
I02735
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-665
893
Author:
Date:
1997 SUPRA (RM502U)
(d)
Inspect the CANCEL switch.
(1)
Push the main switch ON.
(2)
Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3)
When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
Depress the brake pedal
Depress the clutch pedal (M/T)
Shift to except D position (A/T)
Turn the main switch OFF
Pull the cruise control switch to CANCEL
(e)
Inspect the RESUME switch.
(1)
Push the main switch ON.
(2)
Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3)
When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
Depress the brake pedal
Depress the clutch pedal (M/T)
Shift to except D position (A/T)
Turn the main switch OFF
Pull the cruise control switch to CANCEL
(4)
After the control switch is turned to RES/ACC at the
driving speed of more than 40 km/h (25 mph), check
that the vehicle restores the speed prior to the can-
cellation.
BE6443
(1)
(2)
(1)
No.
Operation Method
CRUISE MAIN Indicator Light
Blinking Pattern
Diagnosis
1
3
4
2
Turn SET/COAST switch ON
Turn RES/ACC switch ON
Drive at about 40 km/h
(25 mph) or below
Turn CANCEL switch ON
Turn stop light switch ON
Depress brake pedal
Turn PNP switch OFF
(Shift to except D position)
Turn clutch switch OFF
(Depress clutch pedal)
Drive at about 40 km/h
(25 mph) or higher
SET / COAST switch
circuit is normal
RES / ACC switch circuit
is normal
PNP switch circuit is normal
CANCEL switch circuit
is normal
Clutch switch circuit is normal
Vehicle Speed Sensor is
normal
Stop light switch circuit
is normal
ON
OFF
0.25 sec.
0.25 sec.
1 sec.
Light
ON
OFF
Light
ON
OFF
Light
ON
OFF
Light
ON
OFF
Light
ON
OFF
Light
Switch OFF
Switch ON
Switch ON
Switch OFF
DI-666
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
894
Author:
Date:
1997 SUPRA (RM502U)
5.
Using TOYOTA hand-held tester:
INPUT SIGNAL CHECK
HINT:
(1) For check No.1
−
No.2
Turn the ignition switch ON.
(2) For check No.3
Turn ignition switch ON.
Shift to D position.
(3) For check No.4
Jack up the vehicle.
Start the engine.
Shift to D position.
(a)
Press the control switch to SET/COAST or RES/ACC
position and hold it down or hold it up ”1”.
(b)
Push the main switch ON ”2”.
(c)
Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d)
Turn the SET/COAST or RES/ACC switch OFF.
(e)
Operate each switch as listed in the table below.
(f)
Read the blinking pattern of the CRUISE MAIN indicator
light.
(g)
After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.
DI4XM-01
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-667
895
Author:
Date:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.
DTC No.
(See Page)
Detection Item
Trouble Area
11, 15
(
)
Actuator Motor Circuit
Cruise control actuator motor
Harness or connector between actuator motor and ECU
ECU
12
(
)
Actuator Magnetic Clutch Circuit
Cruise control magnetic clutch
Harness or connector between ECU and magnetic clutch,
magnetic clutch and body ground
ECU
14
(
)
Actuator Motor Circuit
Cruise control actuator motor
Harness or connector between actuator motor and ECU
ECU
21
(
)
Vehicle Speed Sensor Circuit
Vehicle speed sensor
ECU
Combination meter
Harness or connector between vehicle speed sensor and
ECM, ECM and combination meter, combination meter and
ECU
ECU
23
(
)
Vehicle Speed Sensor Circuit
Vehicle speed sensor
Harness or connector (SPD)
ECU
32
(
)
Control Switch Circuit (Cruise Control Switch)
Cruise control switch
Harness or connector between control switch and ECU
ECU
41
Cruise Control ECU
ECU
42
Source voltage drop
Power source
51
(
)
Idle switch circuit
Throttle position sensor
Harness or connector between cruise control ECU and
throttle position sensor
ECU
HINT:
1. When 2 or more codes are indicated, the lowest numbered code will be displayed first.
2. If the inspection ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue check.
3. If the trouble still reappears even though there are no abnormalities in any of the other circuit, then
check or replace the cruise control ECU as the last step.
(*) When the vehicle speed decrease on uphill roads, the speed can be set again and driving contin-
ued. (This is not a malfunction.)
DI4XN-01
I02713
I02713
DLC1
Cruise Control
Actuator
R/B No.2
DOME Fuse
Cruise Control ECU
Cruise Control Switch
Clutch Switch
Vehicle Speed Sensor
Park/Neutral Position Switch
Stop Light Switch
J/B No.1
ECU-B Fuse
ECU-IG Fuse
DI-668
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
896
Author:
Date:
1997 SUPRA (RM502U)
PARTS LOCATION
DI4XO-01
I04621
C16
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-669
897
Author:
Date:
1997 SUPRA (RM502U)
TERMINALS OF ECM
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
D
↔
GND
G R
W B
M/T: Depress clutch pedal
A/T: Shift to except D position
Below 1 V
D
↔
GND
(C16-2
↔
C16-13)
G-R
↔
W-B
M/T: Release clutch pedal
A/T: Shift to D position
10 - 16 V
PI
↔
GND
O
W B
Ignition switch ON
Cruise control main switch ON
Below 1.2 V
PI
↔
GND
(C16-7
↔
C16-13)
O
↔
W-B
Ignition switch ON
Cruise control main switch OFF
10 - 16 V
TC
GND
Ignition switch ON
10 - 16 V
TC
↔
GND
(C16-8
↔
C16-13)
R
↔
W-B
Ignition switch ON
Connect terminals TC and E
1
of DLC1
Below 1 V
OD
↔
GND
LG B
W B
During cruise control driving
OD switch ON
10 - 16 V
OD
↔
GND
(C16-9
↔
C16-13)
LG-B
↔
W-B
During cruise control driving
OD switch OFF (3rd driving)
Below 1 V
L
↔
GND
B W
W B
During cruise control driving
9 - 15 V
L
↔
GND
(C16-10
↔
C16-13)
B-W
↔
W-B
Except during cruise control driving
Below 1 V
MC
↔
GND
G R
W B
During cruise control driving
COAST switch hold ON
9 - 15 V
MC
↔
GND
(C16-1 1
↔
C16-13)
G-R
↔
W-B
During cruise control driving
ACC switch hold ON
Below 1 V
MO
↔
GND
LG
W B
During cruise control driving
ACC switch hold ON
9 - 15 V
MO
↔
GND
(C16-12
↔
C16-13)
LG
↔
W-B
During cruise control driving
COAST switch hold ON
Below 1 V
GND
↔
Body Ground
(C16-13
↔
Body Ground)
W-B
↔
Body
Ground
Constant
Below 1 V
B
↔
GND
(C16-14
↔
C16-13)
B-R
↔
W-B
Ignition switch ON
10 - 16 V
BATT
↔
GND
(C16-15
↔
C16-13)
W-R
↔
W-B
Constant
10 - 16 V
STP
↔
GND
G-W
↔
W-B
Depress brake pedal
10 - 16 V
STP
↔
GND
(C16-16
↔
C16-13)
G-W
↔
W-B
Release brake pedal
Below 1 V
DI-670
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
898
Author:
Date:
1997 SUPRA (RM502U)
Ignition switch ON
10 - 16 V
CCS
GND
Ignition switch ON
CANCEL switch hold ON
4.2 - 8.7 V
CCS
↔
GND
(C16-18
↔
C16-13)
L
↔
W-B
Ignition switch ON
SET/COAST switch hold ON
2.5 - 6.2 V
Ignition switch ON
RES/ACC switch hold ON
0.8 - 3.6 V
CMS
↔
GND
R Y
W B
Ignition switch ON
Main switch ON
Below 1 V
CMS
↔
GND
(C16-19
↔
C16-13)
R-Y
↔
W-B
Ignition switch ON
Main switch OFF
10 - 16 V
Ignition switch ON
10 - 16 V
SPD
↔
GND
(C16-20
↔
C16-13)
P
↔
W-B
During driving
Repeatedly change
from below 1 V to
10 - 16 V
IDL
↔
GND
R B
W B
Ignition switch ON
Throttle valve fully closed
Below 1 V
IDL
↔
GND
(C16-21
↔
C16-13)
R-B
↔
W-B
Ignition switch ON
Throttle valve fully opened
10 - 16 V
ECT
↔
GND
R L
W B
During driving
Gear position O/D
Below 1 V
ECT
↔
GND
(C16-22
↔
C16-13)
R-L
↔
W-B
During driving
Gear position 3rd
10 - 16 V
DI4XP-01
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-671
899
Author:
Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
Symptom
Suspect Area
See page
Cruise control system does not set.
Cruise control system does not operate.
Input signal check No.4: OK
1. ECU Power Source Circuit
2. Wire Harness
3. Main Switch Circuit
4. Control Switch Circuit
5. Stop Light Switch Circuit
6. PNP Switch or Clutch Switch Circuit
7. Actuator Control Cable
8. Actuator Motor Circuit
9. Cruise Control ECU
Input signal check No.4: NG
1. Vehicle Speed Sensor Circuit
2. Cruise Control ECU
,
I
Indicator light does not light up.
1. Wire Harness
2. CRUISE MAIN Indicator Light Circuit
3. Cruise Control ECU
I
Vehicle speed drop when the cruise control switch turned to SET.
1. Actuator Control Cable
2. ECU Power Source Circuit
3. Idle Signal Circuit
4. Actuator Motor Circuit
5. Cruise Control ECU
Set speed deviates on high or low side.
Input signal check No.4: OK
1. Vehicle Speed Sensor Circuit
2. Actuator Control Cable
3. ECU Power Source Circuit
4. Actuator Motor Circuit
5. Cruise Control ECU
Input signal check No.4: NG
1. Cruise Control ECU
Vehicle speed fluctuates when cruise control switch turn to SET.
1. Vehicle Speed Sensor Circuit
2. Actuator Control Cable
3. Idle Signal Circuit
4. ECT Communication Circuit
5. Actuator Motor Circuit
6. Cruise Control ECU
Acceleration response is sluggish when cruise control switch turn
to ”ACCEL” or ”RESUME”.
Input signal check No.4: OK
1. Actuator Control Cable
2. Vehicle Speed Sensor Circuit
3. Actuator Motor Circuit
4. Cruise Control ECU
Input signal check No.4: NG
1. Control Switch Circuit
2. Cruise Control ECU
Set speed does not cancel when brake pedal depressed.
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. Stop Light Switch Circuit
2. Cruise Control ECU
I
Cruise control does not cancel when transmission is shifted to
except D position. (A/T)
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. PNP Switch Circuit
2. Cruise Control ECU
I
DI-672
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
900
Author:
Date:
1997 SUPRA (RM502U)
Cruise control does not cancel when clutch pedal depressed.
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. Clutch Switch Circuit
2. Cruise Control ECU
Cruise control does not cancel when cruise control switch turned
to CANCEL.
Input signal check No.3: OK
1. Cruise Control ECU
Input signal check No.3: NG
1. Control Switch Circuit
2. Cruise Control ECU
Vehicle speed does not decrease when cruise control switch
turned to COAST.
Input signal check No.1: OK
1. Actuator Motor Circuit
2. Actuator Control Cable
3. Vehicle Speed Sensor Circuit
4. Cruise Control ECU
Input signal check No.1: NG
1. Control Switch Circuit
2. Cruise Control ECU
I
Vehicle speed does not accelerate when cruise control switch
turned to ACCEL.
Input signal check No.2: OK
1. Actuator Motor Circuit
2. Actuator Control Cable
3. Vehicle Speed Sensor Circuit
4. Cruise Control ECU
Input signal check No.2: NG
1. Control Switch Circuit
2. Cruise Control ECU
I
Vehicle speed does not return to memorized speed when cruise
control switch turned to RESUME.
Input signal check No.2: OK
1. Actuator Motor Circuit
2. Actuator Control Cable
3. Vehicle Speed Sensor Circuit
4. Cruise Control ECU
Input signal check No.2: NG
1. Control Switch Circuit
2. Cruise Control ECU
Speed can be set below about 40 km/h (25 mph).
Input signal check No.4: OK
1. Cruise Control ECU
Input signal check No.4: NG
1. Vehicle Speed Sensor Circuit
2. Cruise Control ECU
Cruise control does not cancel when speed is less than 40 km/h
(25 mph).
Input signal check No.4: OK
1. Actuator Motor Circuit
2. Cruise Control ECU
Input signal check No.4: NG
1. Vehicle Speed Sensor Circuit
2. Cruise Control ECU
I
I
DI4XQ-01
Duty Ratio =
A + B
A
x 100 (%)
ON
OFF
A
B
1 cycle
I02714
Cruise Control Actuator
Cruise Control ECU
MC
2
C4
1
G-R
C4
LG
9
IB6
15
IB6
G-R
LG
11
C16
C16
12
MC
MO
MO
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-673
901
Author:
Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC
11, 15
Actuator Motor Circuit
CIRCUIT DESCRIPTION
The actuator motor is operated by signals from the ECU. Acceleration and deceleration signals are trans-
mitted by changes in the Duty Ratio (See note below).Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity
in one cycle, and B is the period of non-continuity, then.
DTC No.
Detection Item
Trouble Area
11
Short in actuator motor circuit
Cruise control actuator
Harness or connector between actuator and cruise control
ECU
Cruise control ECU
15
Open in actuator motor circuit
Cruise control actuator
WIRING DIAGRAM
N19821
1
2
DI-674
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
902
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check resistance between terminals MO and MC of cruise control actuator.
PREPARATION:
(a)
Ignition switch ON.
(b)
Disconnect actuator connector.
CHECK:
Measure resistance between terminals 1 and 2.
HINT:
If control plate position is fully opened or fully closed, resistance
can not measure.
OK:
Resistance: more than 4.2
Ω
NG
Replace cruise control actuator.
OK
2
Check wire harness and connector between terminals MO of cruise control ECU
and MO of cruise control actuator (See page
).
NG
Repair or replace harness or connector.
OK
Replace cruise control ECU
(See page
).
I02715
Cruise Control Actuator
Magnetic Clutch
GND
4
C4
C4
3
L
BR-Y
R-L
17
IB6
8
IB6
W-B
R-L
Battery
STOP
10
1I
J/B No.1
W
Cruise Control ECU
13
4
3
2
1
S11
S11
S11
S11
Stop Light Switch
B-W
G-W
G-W
C16
C16
C16
10
16
To Light Failure Sensor
GND
L
STP-
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-675
903
Author:
Date:
1997 SUPRA (RM502U)
DTC
12
Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stoplight switch turns on, supplying electrical power to the stoplight.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (6 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No.
Detection Item
Trouble Area
12
Short in magnetic clutch circuit
Open (0.8 sec.) in magnetic clutch circuit
Cruise contorl actuator magnetic clutch
Harness or connector between ECU and magnetic clutch,
magnetic clutch and body ground
Cruise control ECU
WIRING DIAGRAM
DI4XR-01
N08843
J/B No.1
STOP Fuse
DI-676
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
904
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check STOP fuse.
PREPARATION:
Remove STOP fuse from J/B No.1.
CHECK:
Check fuse continuity.
OK:
There is continuity.
NG
Replace STOP fuse.
OK
2
Check harness and connector between actuator and cruise control actuator (See
page
NG
Repair or replace harness or connector.
OK
N19825
4
3
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-677
905
Author:
Date:
1997 SUPRA (RM502U)
DTC
14
Actuator Mechanical Malfunction
CIRCUIT DESCRIPTION
See page
WIRING DIAGRAM
See page
INSPECTION PROCEDURE
1
Check actuator arm locking operation.
PREPARATION:
(a)
Ignition switch OFF.
(b)
Disconnect actuator connector.
CHECK:
(a)
Connect the positive
lead from the battery to the termi-
nal 3 of actuator and the negative
lead to terminal 4.
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. You will damage the cruise control actuator.
(b)
Move the control plate by hand.
OK:
Control plate does not move.
NG
Replace cruise control actuator.
OK
DI4XS-01
I02716
Full Open Side
Control Plate
4
1
3
2
(+)
(-)
I02717
Full Close Side
Control Plate
4
1
3
2
(+)
(-)
DI-678
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
906
Author:
Date:
1997 SUPRA (RM502U)
2
Check actuator operation.
PREPARATION:
Disconnect the actuator connector.
CHECK:
Connect the positive
lead from the battery to terminals 3 and
1 of actuator, connect the negative
lead to terminals 4 and
2 of actuator.
OK:
Control arm moves to full open side
CHECK:
Connect the positive
lead from the battery to the terminals
4 and 2 of actuator, connect the negative
lead to terminals
3 and 1 of actuator.
OK:
Control arm moves to full close side
NG
Replace actuator.
OK
3
Check harness and connector between actuator and cruise control ECU
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
I00292
Vehicle Speed Sensor
ECU
Combination Meter
Cruise Control ECU
4 pulse/
1 rotation
of rotor shaft
4 pulse/
1 rotation
of rotor shaft
I02718
Speedometer
(Combination Meter)
L-R
2
II1
V10
3
No.1 Vehicle Speed Sensor
(Combination Meter)
T6
5
Telltale Light RH
ODO and TRIP
Meter Circuit
6
T6
P
5
IF2
P
20
C16
Cruise Control ECU
SPD
W
W
W
W
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-679
907
Author:
Date:
1997 SUPRA (RM502U)
DTC
21
Open in Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The vehicle speed sensor circuit is sent to cruise control ECU as vehicle speed signal. For each rotation of
the shaft, the vehicle speed sensor sends a signal through the combination meter to the cruise control ECU
(See the following). The ECU calculates the vehicle speed from this pulse frequency.
DTC No.
Detection Item
Trouble Area
21
Speed signal is not input to the cruise control ECU while cruise
control is set.
Vehicle speed sensor
Combination meter
Cruise control ECU
WIRING DIAGRAM
DI4XT-01
Input Signal
Indicator Light
Blinking Pattern
Drive at about
40 km/h (25 mph)
or below
Drive at about
40 km/h (25 mph)
or higher
Light ON
OFF
Light
ON
OFF
DI-680
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
908
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Input signal check.
CHECK:
(a)
See input signal check on page
(b)
Check indicator light operation when driving with vehicle
speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).
OK:
Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays on
OK
Check and replace cruise control ECU
(See page
).
NG
2
Check harness and connector between speed meter and cruise control ECU
(See page
).
NG
Repair or replace harness or connector.
OK
3
Check vehicle speed sensor (See page
NG
Replace vehicle speed sensor.
OK
Check and replace cruise control ECU
(See page
).
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-681
909
Author:
Date:
1997 SUPRA (RM502U)
DTC
23
Vehicle Speed Signal Abnormal
CIRCUIT DESCRIPTION
See page
DTC No.
Detection Item
Trouble Area
23
Vehicle speed sensor pulse is abnormal. (When sped signal
is not input to the ECU below 0.2 sec., code will be dis-
played.)
Vehicle speed sensor
Cruise control ECU
WIRING DIAGRAM
See page
INSPECTION PROCEDURE
1
Check vehicle speed sensor (See page
NG
Replace vehicle speed sensor.
OK
Check and replace cruise control ECU
(See page
).
DI4XU-01
I02719
W-B
IE
W-B
J/B No.1
1
1J
13
1H
Cruise Control ECU
W-B
W-B
13
C16
C14
17
Cruise Control Switch
CANCEL
SET/
COAST
RESUME/
ACCEL
E
MAIN
CMS
15
C14
5
C14
R-Y
L
19
C16
18
C16
GND
W-B
CMS
CCS
DI-682
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
910
Author:
Date:
1997 SUPRA (RM502U)
DTC
32
Control Switch Circuit
(Cruise Control Switch)
CIRCUIT DESCRIPTION
This circuit carries the SET/COAST, RESUME/ACCEL and CANCEl signals (each voltage) to the ECU.
DTC No.
Detection Item
Trouble Area
32
Short in control switch circuit
Cruise control switch
Harness or connector between control switch and cruise
control ECU.
Cruise control ECU
WIRING DIAGRAM
DI4XV-01
Input Signal
Indicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch
2 Pulses
ON
OFF
ON
OFF
3 Pulses
ON
OFF
SW OFF
SW ON
N16045
3
4
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-683
911
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Input signal check.
PREPARATION:
See input signal check on page
.
CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:
SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned on.
OK
Wait and see.
NG
2
Check control switch.
PREPARATION:
(a)
Remove steering wheel center pad (See page
).
(b)
Disconnect control switch connector.
CHECK:
Measure resistance between terminals 3 and 4 of control switch
connector when control switch is operated.
Switch position
Resistance (
Ω
)
Neutral
∞
(No continuity)
RES/ACC
50 - 80
SET/COAST
180 - 220
CANCEL
400 - 440
OK
Repair control switch.
NG
DI-684
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
912
Author:
Date:
1997 SUPRA (RM502U)
3
Check harness and connector between cruise control switch and cruise control
ECU (See page
NG
Repair or replace harness or connector.
OK
4
Input signal check (See step 1).
OK
Wait and see.
NG
Check and replace cruise control ECU
(See page
).
I02720
IDL1
64
E9
R-B*
1
R*
2
R-B*
1
2*
2
T2
IDL
Throttle Position Sensor
3
IJ1
R-B
21
C16
IDL
Cruise Control ECU
3*
1
R-B*
1
R*
2
R*
2
*
1
: 2JZ-GE Engine
*
2
: 2JZ-GTE Engine
ECM
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-685
913
Author:
Date:
1997 SUPRA (RM502U)
DTC
51
Idle Signal Circuit
CIRCUIT DESCRIPTION
When the idle switch in turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the dis-
crepancy between the throttle valve position and the actuator position sensor value to enable accurate
cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the en-
gine, so also inspect the engine.
DTC No.
Detection Item
Trouble Area
51
Short in idle signal circuit
Harness or connector between cruise control ECU and
throttle position sensor
Throttle position sensor
Cruise control ECU
WIRING DIAGRAM
DI4XW-01
DI-686
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
914
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check throttle position sensor circuit
(2JZ-GE: See page
).
NG
Replace throttle position sensor.
OK
2
Check harness and connector between ECM and throttle position sensor
(See page
).
NG
Repair or replace harness or connector.
OK
3
Check harness and connector between cruise control ECU and throttle position
sensor (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
N19613
2
2
1
2
4
3
10
16
Cruise Control ECU
1B
I1
S11
S11
G-W
B-W
Cruise Control Actuator
R/B No.2
Battery
B
2A
2
AL
T
W-L
J/B No.1
STOP
10
C16
L
STP-
2
W-L
S11
S11
C16
POWER
R-L
R-L
W
Stop Light Switch
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-687
915
Author:
Date:
1997 SUPRA (RM502U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake is on, battery positive voltage normally applies through the STOP fuse and stop light switch
to terminal STP- of the ECU, and the ECU turns the cruise control off.
A fail-safe function is provided so that cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
If the harness connected to terminal STP- has an open circuit, terminal STP- will have battery positive volt-
age and the cruise control will be turned off.
Also, when the brake is on, the magnetic clutch is cut mechanically by the stop light switch, turning the cruise
control off. (See page
for operation of the magnetic clutch)
WIRING DIAGRAM
DI4XX-01
Input Signal
Indicator Light
Blinking Pattern
Stop Light
switch ON
Light
OFF
ON
SW OFF
SW ON
DI-688
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
916
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check operation of stop light.
CHECK:
Check that stop light comes on when brake pedal is depressed, and turns off when brake pedal is released.
NG
Check stop light system.
OK
2
Input signal check.
CHECK:
(a)
.
(b)
Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes off when the brake pedal is
depressed.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
I02722
ON
(-)
STP-(+)
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-689
917
Author:
Date:
1997 SUPRA (RM502U)
3
Check voltage between terminal STP- of cruise control ECU connector and body
ground.
PREPARATION:
Remove cruise control ECU with connectors still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminal STP-of cruise control
ECU connector and body ground, when the brake pedal
is depressed and released.
OK:
Depressed
10 - 14 V
Released
Below 1 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
4
Check for open in harness and connectors between terminal STP- of cruise con-
trol ECU and stop light switch (See page
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
N19614
ECM
E10
E9
IJ2
IJ2
C16
C16
E2
E2
12
9
8
2
22
9
11
10
Cruise Control ECU
OD
ECT
BR-B*1
LG-B
LG-B*1
(A/T)
R-L
(A/T)
OD1
S2
*1: 2JZ-GTE Engine
*2: 2JZ-GE Engine
R-L
(A/T)
R-L
(A/T)
Electronically Controlled Transmission Solenoid
*1
*2
S2
DI-690
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
918
Author:
Date:
1997 SUPRA (RM502U)
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under cruise control, in order to reduce shifting due to ON-OFF overdrive operation and
to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a signal
to prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronically
controlled transmission.
Terminal ECM of the cruise control ECU detects the shift change signal (output to electronically controlled
transmission No.2 solenoid) from the electronically controlled transmission.
If vehicle speed down, also when terminal electronically controlled transmission of the cruise control ECU
receive down shifting signal, it sends a signal from terminal OD to ECM to cut overdrive until the end of the
uphill slope, and the gear shifts are reduced and gear shift points in the electronically controlled transmission
are changed.
WIRING DIAGRAM
DI4XY-01
I02724
ON
(-)
OD (+)
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-691
919
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON
↔
OFF occurs with operation of OD switch ON
↔
OFF.
NG
Check and repair electronically controlled
transmission (See page
OK
2
Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
(a)
Disconnect cruise control ECU connector.
(b)
Turn ignition switch ON.
(c)
Measure voltage between terminal OD of harness side
connector of cruise control ECU and body ground.
OK:
Voltage: 10 - 14 V
NG
OK
N19837
(-)
ECT (+)
DI-692
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
920
Author:
Date:
1997 SUPRA (RM502U)
3
Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a)
Connect cruise control ECU connector.
(b)
Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of cruise control ECU
connector and body ground when OD switch is ON and OFF.
OK:
OD switch position
Voltage
ON
8 - 14 V
OFF
Below 0.5 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
4
Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-693
921
Author:
Date:
1997 SUPRA (RM502U)
5
Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
I02725
Ignition Switch
5
1J
GAUGE
12 1E
12
1H
J/B No.1
Y
(M/T)
1
C15
C15
2
Cruise Control Clutch Start Switch (M/T)
(M/T)
G-R
G-R
(A/T)
7 IJ2
Y
23
II1
Y
(A/T)
4
P2
P2
9
Park/Neutral Position Switch (A/T)
G-R
2
C16
D
Cruise Control ECU
Y
*1: 2JZ-GTE Engine
*2: 2JZ-GE Engine
DI-694
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
922
Author:
Date:
1997 SUPRA (RM502U)
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is put in except D position, a signal is sent from the park/neutral position switch to
the ECU. When this signal is input during cruise control driving, the ECU cancels the cruise control.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG
Proceed to engine troubleshooting
(2JZ-GE: See page
,
2JZ-GTE: See page
OK
DI4XZ-01
Input Signal
Indicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to
except D range)
Light
ON
OFF
SW ON
SW OFF
I02726
ON
(-)
D (+)
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-695
923
Author:
Date:
1997 SUPRA (RM502U)
2
Input signal check.
PREPARATION:
See input signal check on page
.
CHECK:
Check the indicator light when shifting into except D position.
OK:
The indicator light goes off when shifting into except
D position.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
3
Check voltage between terminal D of cruise control ECU and body ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of cruise control ECU con-
nector and body ground when shifting into D position and other
positions.
OK:
Shift Position
Voltage
D position
10 - 14 V
Other positions
Below 1 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
DI-696
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
924
Author:
Date:
1997 SUPRA (RM502U)
4
Check harness and connector between PNP switch and cruise control ECU
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
Input Signal
Indicator Light
Blinking Pattern
Clutch switch
OFF (Depress
clutch pedal)
Light
ON
OFF
SW ON
SW OFF
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-697
925
Author:
Date:
1997 SUPRA (RM502U)
Clutch Switch Circuit
CIRCUIT DESCRIPTION
When the clutch pedal is depressed, the clutch switch sends a signal to the cruise control ECU. When the
signal is input to the cruise control ECU during cruise control driving, the cruise control ECU cancels cruise
control.
WIRING DIAGRAM
Refer to park/neutral position switch circuit on page
.
INSPECTION PROCEDURE
1
Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG
Proceed to engine troubleshooting
(2JZ-GE: See page
,
2JZ-GTE: See page
OK
2
Input signal check.
PREPARATION:
See input signal check on page
.
CHECK:
Check the indicator light when the clutch pedal is depressed.
OK:
The indicator light goes off when the clutch pedal is
depressed.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
DI4Y0-01
I02726
ON
(-)
D (+)
DI-698
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
926
Author:
Date:
1997 SUPRA (RM502U)
3
Check voltage between terminal D of cruise control ECU and body ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of cruise control ECU con-
nector and body ground when the clutch pedal is depressed.
OK:
Shift Position
Voltage
ON (Pedal depressed)
Below 1 V
OFF
10 - 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
4
Check for open in harness and connector between ECU and GAUGE fuse
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
N19616
2
1B
1J
I19
I19
1J
1I
1J
1H
C16
C16
Cruise Control ECU
Cruise Control Switch
Battery
R/B No.2
4
4
1
13
2
4
5
9
W
14
13
IE
W-B
W-B
J/B No.1
Ignition Switch
J/B No.1
J/B No.1
AM1
AL
T
GND
B
2
2
2A
W-B
W-B
W
B-Y
B-R
ECU-IG
B
W
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-699
927
Author:
Date:
1997 SUPRA (RM502U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc.. When terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI4Y1-01
N08843
J/B No.1
ECU-IG Fuse
I02728
ON
GND (-)
B (+)
DI-700
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
928
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check ECU-IG fuse.
PREPARATION:
Remove ECU-IG fuse from junction block No.1.
CHECK:
Check continuity of ECU-IG fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to ECU-IG fuse.
OK
2
Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminals B and GND of cruise
control ECU connector.
OK:
Voltage 10 - 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
N19842
GND
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-701
929
Author:
Date:
1997 SUPRA (RM502U)
3
Check resistance between terminal GND of cruise control ECU connector and
body ground (See page
CHECK:
Measure resistance between terminal GND of cruise control
ECU connector and body ground.
OK:
Resistance: Below 1
Ω
NG
Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween battery and cruise control ECU
(See page
).
N19617
Battery
2A
1B
1H
C16
15
8
2
2
2
2
R/B No.2
J/B No.1
Cruise Control ECU
ECU-B
W-R
B
1
ALT
POWER
BATT
W-L
W
DI-702
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
930
Author:
Date:
1997 SUPRA (RM502U)
Back-up Power Source Circuit
CIRCUIT DESCRIPTION
The ECU back-up power source provides power even when the ignition is off and is used for DTC memory,
etc..
WIRING DIAGRAM
DI4Y2-01
N09001
J/B No.2
DOME Fuse
N19843
(-)
BATT (+)
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-703
931
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check DOME fuse.
PREPARATION:
Remove DOME fuse from relay block No.2.
CHECK:
Check continuity of DOME fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to the DOME fuse.
OK
2
Check voltage between terminal BATT of cruise control ECU connector and body
ground (See page
).
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
Measure voltage between terminal BATT of cruise control ECU
connector and body ground.
OK:
Voltage: 10 - 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
Check and repair harness and connector be-
tween battery and cruise control ECU
(See page
).
I02730
ON
(-)
CMS (+)
DI-704
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
932
Author:
Date:
1997 SUPRA (RM502U)
Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned off, the cruise control does not operate.
WIRING DIAGRAM
See page
INSPECTION PROCEDURE
1
Check voltage between terminal CMS of cruise control ECU connector and body
ground.
PREPARATION:
Remove cruise control ECU with connector still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminal CMS of cruise control
ECU connector when main switch is held on and off.
OK:
Main switch
Voltage
OFF
10 - 14 V
ON
Below 1 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
DI4Y3-01
N15969
3
5
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-705
933
Author:
Date:
1997 SUPRA (RM502U)
2
Check main switch continuity.
PREPARATION:
(a)
Remove steering wheel center pad (See page
).
(b)
Disconnect cruise control switch connector.
CHECK:
Check continuity between terminals 3 and 5 of cruise control
switch connector when main switch is held on and off.
OK:
Switch position
Tester connection
Specified condition
OFF
3 - 5
No continuity
Hold ON
3 - 5
Continuity
NG
Replace control switch.
OK
3
Check harness and connector between cruise control ECU and main switch
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
N19618
I18
I18
1J
1B
1J
1E
C10
C12
IF2
2A
4
4
2
4
5
12
9
6
11
10
7
O
DLC2
PI
Cruise Control ECU
1
2
2
2
R/B No.2
J/B No.1
Vehicle Speed Sensor
Y
R
BR
4
W
Ignition Switch
AM1
ALT
Battery
IF
GAUGE
J/B No.1
C10
C12
C16
W
BR
BR
I8
W
B
O
O
O
Combination Meter
CRUISE Indicator
CRUISE
R
DI-706
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
934
Author:
Date:
1997 SUPRA (RM502U)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI4Y4-01
I02732
ON
(-)
PI (+)
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-707
935
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminals PI and GND of cruise control ECU connector.
PREPARATION:
Ignition switch ON.
CHECK:
Measure voltage between terminals PI and GND of cruise con-
trol ECU connector when main switch on and off.
OK:
Switch position
Voltage
OFF
10 - 16 V
ON
Below 1.2 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
2
Check combination meter (See page
NG
Replace combination meter.
OK
Check and replace cruise control ECU
(See page
).
I02733
DLC2
DLC1
TC
4
D5
R
TC
11
D1
P-B*
1
21
II1
11
IF1
R
R
8
C16
Cruise Control ECU
TC
P-B
R*
2
*
1
: 2JZ-GTE
*
2
: 2JZ-GE
DI-708
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
936
Author:
Date:
1997 SUPRA (RM502U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that DTC output is required.
WIRING DIAGRAM
DI4Y5-01
N15970
DLC1
E
1
Tc
-
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI-709
937
Author:
Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1
Check voltage between terminals Tc and E
1
of DLC2.
CHECK:
(a)
Turn ignition switch ON.
(b)
Measure voltage between terminals Tc and E
1
of DLC2.
OK:
Voltage: 10 - 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
2
Check harness and connector between cruise control ECU and DLC2, DLC2 and
body ground (See page
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
Document Outline
- DI-440.pdf
- DI-441.pdf
- DI-442.pdf
- DI-447.pdf
- DI-449.pdf
- DI-450.pdf
- DI-452.pdf
- DI-453.pdf
- DI-456.pdf
- DI-460.pdf
- DI-469.pdf
- DI-475.pdf
- DI-479.pdf
- DI-480.pdf
- DI-482.pdf
- DI-484.pdf
- DI-485.pdf
- DI-488.pdf
- DI-494.pdf
- DI-496.pdf
- DI-498.pdf
- DI-499.pdf
- DI-500.pdf
- DI-501.pdf
- DI-503.pdf
- DI-505.pdf
- DI-506.pdf
- DI-508.pdf
- DI-509.pdf
- DI-513.pdf
- DI-516.pdf
- DI-519.pdf
- DI-522.pdf
- DI-526.pdf
- DI-530.pdf
- DI-532.pdf
- DI-534.pdf
- DI-535.pdf
- DI-538.pdf
- DI-542.pdf
- DI-545.pdf
- DI-547.pdf
- DI-550.pdf
- DI-551.pdf
- DI-553.pdf
- DI-555.pdf
- DI-556.pdf
- DI-557.pdf
- DI-560.pdf
- DI-561.pdf
- DI-562.pdf
- DI-563.pdf
- DI-564.pdf
- DI-571.pdf
- DI-577.pdf
- DI-582.pdf
- DI-586.pdf
- DI-588.pdf
- DI-592.pdf
- DI-595.pdf
- DI-598.pdf
- DI-600.pdf
- DI-603.pdf
- DI-608.pdf
- DI-609.pdf
- DI-610.pdf
- DI-612.pdf
- DI-613.pdf
- DI-615.pdf
- DI-617.pdf
- DI-619.pdf
- DI-621.pdf
- DI-623.pdf
- DI-626.pdf
- DI-628.pdf
- DI-630.pdf
- DI-636.pdf
- DI-638.pdf
- DI-640.pdf
- DI-642.pdf
- DI-643.pdf
- DI-644.pdf
- DI-647.pdf
- DI-650.pdf
- DI-653.pdf
- DI-656.pdf
- DI-658.pdf
- DI-660.pdf
- DI-661.pdf
- DI-662.pdf
- DI-667.pdf
- DI-668.pdf
- DI-669.pdf
- DI-671.pdf
- DI-673.pdf
- DI-675.pdf
- DI-677.pdf
- DI-679.pdf
- DI-681.pdf
- DI-682.pdf
- DI-685.pdf
- DI-687.pdf
- DI-690.pdf
- DI-694.pdf
- DI-697.pdf
- DI-699.pdf
- DI-702.pdf
- DI-704.pdf
- DI-706.pdf
- DI-708.pdf
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